Triple Monitors, Dual nVidia GPU's. HELP!

[xstrada2501]

Ok, so I will link the .log file. I can see where the 660ti comes up, but I can't figure out what's being done with it.

I don't expect you to to go through this for me, but please know I really do appreciate your help and expertise.

[    27.106] (--) Log file renamed from "/var/log/Xorg.pid-1940.log" to "/var/log/Xorg.0.log"[    27.116] 
X.Org X Server 1.20.4
X Protocol Version 11, Revision 0
[    27.116] Build Operating System: Linux 4.4.0-148-generic x86_64 Ubuntu
[    27.116] Current Operating System: Linux Virgil-Linux 5.0.0-27-generic #28~18.04.1-Ubuntu SMP Thu Aug 22 03:00:32 UTC 2019 x86_64
[    27.116] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.0.0-27-generic root=UUID=0a32abd3-239f-4c81-8d57-7091d51f3754 ro quiet splash vt.handoff=1
[    27.116] Build Date: 02 May 2019  08:06:54AM
[    27.116] xorg-server-hwe-18.04 2:1.20.4-1ubuntu3~18.04.1 (For technical support please see http://www.ubuntu.com/support) 
[    27.116] Current version of pixman: 0.34.0
[    27.116]     Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
[    27.116] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    27.116] (==) Log file: "/var/log/Xorg.0.log", Time: Mon Sep  9 07:47:47 2019
[    27.126] (==) Using config file: "/etc/X11/xorg.conf"
[    27.126] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    27.176] (==) ServerLayout "Layout0"
[    27.176] (**) |-->Screen "Screen0" (0)
[    27.176] (**) |   |-->Monitor "Monitor0"
[    27.189] (**) |   |-->Device "Device0"
[    27.189] (**) |-->Input Device "Keyboard0"
[    27.189] (**) |-->Input Device "Mouse0"
[    27.189] (**) Option "Xinerama" "0"
[    27.189] (==) Automatically adding devices
[    27.189] (==) Automatically enabling devices
[    27.189] (==) Automatically adding GPU devices
[    27.189] (==) Automatically binding GPU devices
[    27.189] (==) Max clients allowed: 256, resource mask: 0x1fffff
[    27.189] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    27.189]     Entry deleted from font path.
[    27.189] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[    27.189]     Entry deleted from font path.
[    27.189] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[    27.189]     Entry deleted from font path.
[    27.189] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[    27.189]     Entry deleted from font path.
[    27.189] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[    27.189]     Entry deleted from font path.
[    27.189] (==) FontPath set to:
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/Type1,
    built-ins
[    27.189] (==) ModulePath set to "/usr/lib/xorg/modules"
[    27.189] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[    27.189] (WW) Disabling Keyboard0
[    27.189] (WW) Disabling Mouse0
[    27.189] (II) Loader magic: 0x55ce4f817020
[    27.189] (II) Module ABI versions:
[    27.189]     X.Org ANSI C Emulation: 0.4
[    27.189]     X.Org Video Driver: 24.0
[    27.189]     X.Org XInput driver : 24.1
[    27.189]     X.Org Server Extension : 10.0
[    27.190] (++) using VT number 1


[    27.193] (II) systemd-logind: took control of session /org/freedesktop/login1/session/c3
[    27.194] (II) xfree86: Adding drm device (/dev/dri/card0)
[    27.195] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 12 paused 0
[    27.195] (II) xfree86: Adding drm device (/dev/dri/card1)
[    27.196] (II) systemd-logind: got fd for /dev/dri/card1 226:1 fd 13 paused 0
[    27.198] (**) OutputClass "nvidia" ModulePath extended to "/usr/lib/x86_64-linux-gnu/nvidia-430/xorg,/usr/lib/xorg/modules"
[    27.198] (**) OutputClass "nvidia" ModulePath extended to "/usr/lib/x86_64-linux-gnu/nvidia-430/xorg,/usr/lib/x86_64-linux-gnu/nvidia-430/xorg,/usr/lib/xorg/modules"
[    27.199] (--) PCI:*(1@0:0:0) 10de:17c8:3842:4993 rev 161, Mem @ 0xf6000000/16777216, 0xd0000000/268435456, 0xe0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/131072
[    27.200] (--) PCI: (2@0:0:0) 10de:1183:1043:841e rev 161, Mem @ 0xf4000000/16777216, 0xe8000000/134217728, 0xf0000000/33554432, I/O @ 0x0000d000/128, BIOS @ 0x????????/524288
[    27.200] (II) "glx" will be loaded. This was enabled by default and also specified in the config file.
[    27.200] (II) LoadModule: "dbe"
[    27.200] (II) Module "dbe" already built-in
[    27.200] (II) LoadModule: "extmod"
[    27.200] (II) Module "extmod" already built-in
[    27.200] (II) LoadModule: "glx"
[    27.256] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    27.296] (II) Module glx: vendor="X.Org Foundation"
[    27.296]     compiled for 1.20.4, module version = 1.0.0
[    27.296]     ABI class: X.Org Server Extension, version 10.0
[    27.296] (II) LoadModule: "nvidia"
[    27.296] (II) Loading /usr/lib/x86_64-linux-gnu/nvidia-430/xorg/nvidia_drv.so
[    27.406] (II) Module nvidia: vendor="NVIDIA Corporation"
[    27.406]     compiled for 1.6.99.901, module version = 1.0.0
[    27.406]     Module class: X.Org Video Driver
[    27.426] (II) NVIDIA dlloader X Driver  430.26  Tue Jun  4 17:52:10 CDT 2019
[    27.426] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[    27.436] (II) systemd-logind: releasing fd for 226:0
[    27.446] (II) Loading sub module "fb"
[    27.446] (II) LoadModule: "fb"
[    27.446] (II) Loading /usr/lib/xorg/modules/libfb.so
[    27.476] (II) Module fb: vendor="X.Org Foundation"
[    27.476]     compiled for 1.20.4, module version = 1.0.0
[    27.476]     ABI class: X.Org ANSI C Emulation, version 0.4
[    27.476] (II) Loading sub module "wfb"
[    27.476] (II) LoadModule: "wfb"
[    27.476] (II) Loading /usr/lib/xorg/modules/libwfb.so
[    27.506] (II) Module wfb: vendor="X.Org Foundation"
[    27.506]     compiled for 1.20.4, module version = 1.0.0
[    27.506]     ABI class: X.Org ANSI C Emulation, version 0.4
[    27.506] (II) Loading sub module "ramdac"
[    27.506] (II) LoadModule: "ramdac"
[    27.506] (II) Module "ramdac" already built-in
[    27.516] (II) systemd-logind: releasing fd for 226:1
[    27.517] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
[    27.517] (==) NVIDIA(0): RGB weight 888
[    27.518] (==) NVIDIA(0): Default visual is TrueColor
[    27.518] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[    27.526] (II) Applying OutputClass "nvidia" options to /dev/dri/card0
[    27.526] (**) NVIDIA(0): Option "Stereo" "0"
[    27.526] (**) NVIDIA(0): Option "nvidiaXineramaInfoOrder" "DFP-1"
[    27.526] (**) NVIDIA(0): Option "SLI" "Off"
[    27.526] (**) NVIDIA(0): Option "MultiGPU" "Off"
[    27.526] (**) NVIDIA(0): Option "BaseMosaic" "off"
[    27.526] (**) NVIDIA(0): Option "AllowEmptyInitialConfiguration"
[    27.526] (**) NVIDIA(0): Stereo disabled by request
[    27.526] (**) NVIDIA(0): NVIDIA SLI disabled.
[    27.526] (**) NVIDIA(0): NVIDIA Multi-GPU disabled.
[    27.526] (**) NVIDIA(0): Option "MetaModes" "nvidia-auto-select +0+0"
[    27.526] (**) NVIDIA(0): Enabling 2D acceleration
[    27.526] (II) Loading sub module "glxserver_nvidia"
[    27.526] (II) LoadModule: "glxserver_nvidia"
[    27.527] (II) Loading /usr/lib/x86_64-linux-gnu/nvidia-430/xorg/libglxserver_nvidia.so
[    28.206] (II) Module glxserver_nvidia: vendor="NVIDIA Corporation"
[    28.206]     compiled for 1.6.99.901, module version = 1.0.0
[    28.206]     Module class: X.Org Server Extension
[    28.216] (II) NVIDIA GLX Module  430.26  Tue Jun  4 17:50:01 CDT 2019
[    28.550] (--) NVIDIA(0): Valid display device(s) on GPU-0 at PCI:1:0:0
[    28.550] (--) NVIDIA(0):     CRT-0
[    28.550] (--) NVIDIA(0):     DFP-0
[    28.550] (--) NVIDIA(0):     DFP-1 (boot)
[    28.550] (--) NVIDIA(0):     DFP-2
[    28.550] (--) NVIDIA(0):     DFP-3
[    28.550] (--) NVIDIA(0):     DFP-4
[    28.550] (--) NVIDIA(0):     DFP-5
[    28.550] (--) NVIDIA(0):     DFP-6
[    28.550] (--) NVIDIA(0):     DFP-7
[    28.551] (II) NVIDIA(0): NVIDIA GPU GeForce GTX 980 Ti (GM200-A) at PCI:1:0:0 (GPU-0)
[    28.551] (--) NVIDIA(0): Memory: 6291456 kBytes
[    28.551] (--) NVIDIA(0): VideoBIOS: 84.00.36.00.90
[    28.551] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[    28.555] (--) NVIDIA(GPU-0): CRT-0: disconnected
[    28.555] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[    28.555] (--) NVIDIA(GPU-0): 
[    28.559] (--) NVIDIA(GPU-0): DFP-0: disconnected
[    28.559] (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
[    28.559] (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[    28.559] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): connected
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): Internal TMDS
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): 600.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-2: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-2: Internal DisplayPort
[    28.590] (--) NVIDIA(GPU-0): DFP-2: 960.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-3: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[    28.590] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-4: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[    28.590] (--) NVIDIA(GPU-0): DFP-4: 960.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-5: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-5: Internal TMDS
[    28.590] (--) NVIDIA(GPU-0): DFP-5: 165.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-6: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort
[    28.590] (--) NVIDIA(GPU-0): DFP-6: 960.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.590] (--) NVIDIA(GPU-0): DFP-7: disconnected
[    28.590] (--) NVIDIA(GPU-0): DFP-7: Internal TMDS
[    28.590] (--) NVIDIA(GPU-0): DFP-7: 165.0 MHz maximum pixel clock
[    28.590] (--) NVIDIA(GPU-0): 
[    28.594] (II) NVIDIA(0): Validated MetaModes:
[    28.594] (II) NVIDIA(0):     "nvidia-auto-select+0+0"
[    28.594] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080
[    28.597] (--) NVIDIA(0): DPI set to (54, 54); computed from "UseEdidDpi" X config
[    28.597] (--) NVIDIA(0):     option
[    28.837] (--) NVIDIA(0): Valid display device(s) on GPU-1 at PCI:2:0:0
[    28.837] (--) NVIDIA(0):     CRT-0
[    28.837] (--) NVIDIA(0):     DFP-0 (boot)
[    28.837] (--) NVIDIA(0):     DFP-1
[    28.837] (--) NVIDIA(0):     DFP-2
[    28.837] (--) NVIDIA(0):     DFP-3
[    28.837] (--) NVIDIA(0):     DFP-4
[    28.844] (--) NVIDIA(GPU-1): CRT-0: disconnected
[    28.844] (--) NVIDIA(GPU-1): CRT-0: 400.0 MHz maximum pixel clock
[    28.844] (--) NVIDIA(GPU-1): 
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): connected
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): Internal TMDS
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): 330.0 MHz maximum pixel clock
[    28.860] (--) NVIDIA(GPU-1): 
[    28.860] (--) NVIDIA(GPU-1): DFP-1: disconnected
[    28.860] (--) NVIDIA(GPU-1): DFP-1: Internal TMDS
[    28.860] (--) NVIDIA(GPU-1): DFP-1: 165.0 MHz maximum pixel clock
[    28.860] (--) NVIDIA(GPU-1): 
[    28.860] (--) NVIDIA(GPU-1): DFP-2: disconnected
[    28.860] (--) NVIDIA(GPU-1): DFP-2: Internal TMDS
[    28.860] (--) NVIDIA(GPU-1): DFP-2: 165.0 MHz maximum pixel clock
[    28.860] (--) NVIDIA(GPU-1): 
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): connected
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): Internal TMDS
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): 330.0 MHz maximum pixel clock
[    28.867] (--) NVIDIA(GPU-1): 
[    28.867] (--) NVIDIA(GPU-1): DFP-4: disconnected
[    28.867] (--) NVIDIA(GPU-1): DFP-4: Internal DisplayPort
[    28.867] (--) NVIDIA(GPU-1): DFP-4: 960.0 MHz maximum pixel clock
[    28.867] (--) NVIDIA(GPU-1): 
[    28.887] (II) NVIDIA(GPU-1): NVIDIA GPU GeForce GTX 660 Ti (GK104) at PCI:2:0:0 (GPU-1)
[    28.887] (--) NVIDIA(GPU-1): Memory: 2097152 kBytes
[    28.887] (--) NVIDIA(GPU-1): VideoBIOS: 80.04.4b.00.5a
[    28.887] (II) NVIDIA(GPU-1): Detected PCI Express Link width: 16X
[    28.887] (II) NVIDIA: Using 6144.00 MB of virtual memory for indirect memory
[    28.887] (II) NVIDIA:     access.
[    29.050] (II) NVIDIA(0): Setting mode "nvidia-auto-select+0+0"
[    29.206] (==) NVIDIA(0): Disabling shared memory pixmaps
[    29.206] (==) NVIDIA(0): Backing store enabled
[    29.206] (==) NVIDIA(0): Silken mouse enabled
[    29.226] (**) NVIDIA(0): DPMS enabled
[    29.256] (II) Loading sub module "dri2"
[    29.256] (II) LoadModule: "dri2"
[    29.256] (II) Module "dri2" already built-in
[    29.256] (II) NVIDIA(0): [DRI2] Setup complete
[    29.256] (II) NVIDIA(0): [DRI2]   VDPAU driver: nvidia
[    29.265] (II) Initializing extension Generic Event Extension
[    29.266] (II) Initializing extension SHAPE
[    29.266] (II) Initializing extension MIT-SHM
[    29.266] (II) Initializing extension XInputExtension
[    29.276] (II) Initializing extension XTEST
[    29.276] (II) Initializing extension BIG-REQUESTS
[    29.276] (II) Initializing extension SYNC
[    29.276] (II) Initializing extension XKEYBOARD
[    29.276] (II) Initializing extension XC-MISC
[    29.277] (II) Initializing extension SECURITY
[    29.277] (II) Initializing extension XFIXES
[    29.277] (II) Initializing extension RENDER
[    29.277] (II) Initializing extension RANDR
[    29.277] (II) Initializing extension COMPOSITE
[    29.277] (II) Initializing extension DAMAGE
[    29.277] (II) Initializing extension MIT-SCREEN-SAVER
[    29.278] (II) Initializing extension DOUBLE-BUFFER
[    29.278] (II) Initializing extension RECORD
[    29.278] (II) Initializing extension DPMS
[    29.278] (II) Initializing extension Present
[    29.278] (II) Initializing extension DRI3
[    29.278] (II) Initializing extension X-Resource
[    29.278] (II) Initializing extension XVideo
[    29.279] (II) Initializing extension XVideo-MotionCompensation
[    29.279] (II) Initializing extension SELinux
[    29.279] (II) SELinux: Disabled on system
[    29.279] (II) Initializing extension GLX
[    29.279] (II) Initializing extension GLX
[    29.279] (II) Indirect GLX disabled.
[    29.279] (II) GLX: Another vendor is already registered for screen 0
[    29.279] (II) Initializing extension XFree86-VidModeExtension
[    29.279] (II) Initializing extension XFree86-DGA
[    29.279] (II) Initializing extension XFree86-DRI
[    29.285] (II) Initializing extension DRI2
[    29.286] (II) Initializing extension NV-GLX
[    29.286] (II) Initializing extension NV-CONTROL
[    29.286] (II) Initializing extension XINERAMA
[    29.566] (II) config/udev: Adding input device Power Button (/dev/input/event1)
[    29.566] (**) Power Button: Applying InputClass "libinput keyboard catchall"
[    29.566] (II) LoadModule: "libinput"
[    29.566] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so
[    29.590] (II) Module libinput: vendor="X.Org Foundation"
[    29.590]     compiled for 1.20.1, module version = 0.28.1
[    29.590]     Module class: X.Org XInput Driver
[    29.590]     ABI class: X.Org XInput driver, version 24.1
[    29.590] (II) Using input driver 'libinput' for 'Power Button'
[    29.591] (II) systemd-logind: got fd for /dev/input/event1 13:65 fd 45 paused 0
[    29.591] (**) Power Button: always reports core events
[    29.591] (**) Option "Device" "/dev/input/event1"
[    29.591] (**) Option "_source" "server/udev"
[    29.592] (II) event1  - Power Button: is tagged by udev as: Keyboard
[    29.592] (II) event1  - Power Button: device is a keyboard
[    29.592] (II) event1  - Power Button: device removed
[    29.592] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1/event1"
[    29.592] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 6)
[    29.592] (**) Option "xkb_model" "pc105"
[    29.592] (**) Option "xkb_layout" "us"
[    29.592] (II) event1  - Power Button: is tagged by udev as: Keyboard
[    29.592] (II) event1  - Power Button: device is a keyboard
[    29.593] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[    29.593] (**) Power Button: Applying InputClass "libinput keyboard catchall"
[    29.593] (II) Using input driver 'libinput' for 'Power Button'
[    29.594] (II) systemd-logind: got fd for /dev/input/event0 13:64 fd 48 paused 0
[    29.594] (**) Power Button: always reports core events
[    29.594] (**) Option "Device" "/dev/input/event0"
[    29.594] (**) Option "_source" "server/udev"
[    29.594] (II) event0  - Power Button: is tagged by udev as: Keyboard
[    29.594] (II) event0  - Power Button: device is a keyboard
[    29.594] (II) event0  - Power Button: device removed
[    29.594] (**) Option "config_info" "udev:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0/event0"
[    29.594] (II) XINPUT: Adding extended input device "Power Button" (type: KEYBOARD, id 7)
[    29.594] (**) Option "xkb_model" "pc105"
[    29.594] (**) Option "xkb_layout" "us"
[    29.595] (II) event0  - Power Button: is tagged by udev as: Keyboard
[    29.595] (II) event0  - Power Button: device is a keyboard
[    29.595] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=3 (/dev/input/event16)
[    29.595] (II) No input driver specified, ignoring this device.
[    29.595] (II) This device may have been added with another device file.
[    29.595] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=7 (/dev/input/event17)
[    29.595] (II) No input driver specified, ignoring this device.
[    29.595] (II) This device may have been added with another device file.
[    29.595] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=8 (/dev/input/event18)
[    29.595] (II) No input driver specified, ignoring this device.
[    29.595] (II) This device may have been added with another device file.
[    29.596] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=9 (/dev/input/event19)
[    29.596] (II) No input driver specified, ignoring this device.
[    29.596] (II) This device may have been added with another device file.
[    29.596] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=3 (/dev/input/event20)
[    29.596] (II) No input driver specified, ignoring this device.
[    29.596] (II) This device may have been added with another device file.
[    29.597] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=7 (/dev/input/event21)
[    29.597] (II) No input driver specified, ignoring this device.
[    29.597] (II) This device may have been added with another device file.
[    29.597] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=8 (/dev/input/event22)
[    29.597] (II) No input driver specified, ignoring this device.
[    29.597] (II) This device may have been added with another device file.
[    29.597] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=9 (/dev/input/event23)
[    29.597] (II) No input driver specified, ignoring this device.
[    29.597] (II) This device may have been added with another device file.
[    29.598] (II) config/udev: Adding input device SteelSeries SteelSeries Arctis 5 (/dev/input/event12)
[    29.598] (**) SteelSeries SteelSeries Arctis 5: Applying InputClass "libinput keyboard catchall"
[    29.598] (II) Using input driver 'libinput' for 'SteelSeries SteelSeries Arctis 5'
[    29.599] (II) systemd-logind: got fd for /dev/input/event12 13:76 fd 49 paused 0
[    29.599] (**) SteelSeries SteelSeries Arctis 5: always reports core events
[    29.599] (**) Option "Device" "/dev/input/event12"
[    29.599] (**) Option "_source" "server/udev"
[    29.599] (II) event12 - SteelSeries SteelSeries Arctis 5: is tagged by udev as: Keyboard
[    29.599] (II) event12 - SteelSeries SteelSeries Arctis 5: device is a keyboard
[    29.599] (II) event12 - SteelSeries SteelSeries Arctis 5: device removed
[    29.599] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.5/0003:1038:1250.0004/input/input15/event12"
[    29.599] (II) XINPUT: Adding extended input device "SteelSeries SteelSeries Arctis 5" (type: KEYBOARD, id 8)
[    29.599] (**) Option "xkb_model" "pc105"
[    29.599] (**) Option "xkb_layout" "us"
[    29.600] (II) event12 - SteelSeries SteelSeries Arctis 5: is tagged by udev as: Keyboard
[    29.600] (II) event12 - SteelSeries SteelSeries Arctis 5: device is a keyboard
[    29.601] (II) config/udev: Adding input device SteelSeries SteelSeries Rival 500 Gaming Mouse (/dev/input/event9)
[    29.601] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse: Applying InputClass "libinput pointer catchall"
[    29.601] (II) Using input driver 'libinput' for 'SteelSeries SteelSeries Rival 500 Gaming Mouse'
[    29.658] (II) systemd-logind: got fd for /dev/input/event9 13:73 fd 50 paused 0
[    29.658] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse: always reports core events
[    29.658] (**) Option "Device" "/dev/input/event9"
[    29.658] (**) Option "_source" "server/udev"
[    29.658] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: is tagged by udev as: Mouse
[    29.658] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: device is a pointer
[    29.658] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: device removed
[    29.659] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.1/0003:1038:170E.0002/input/input12/event9"
[    29.659] (II) XINPUT: Adding extended input device "SteelSeries SteelSeries Rival 500 Gaming Mouse" (type: MOUSE, id 9)
[    29.659] (**) Option "AccelerationScheme" "none"
[    29.659] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse: (accel) selected scheme none/0
[    29.659] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse: (accel) acceleration factor: 2.000
[    29.659] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse: (accel) acceleration threshold: 4
[    29.659] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: is tagged by udev as: Mouse
[    29.659] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: device is a pointer
[    29.660] (II) config/udev: Adding input device SteelSeries SteelSeries Rival 500 Gaming Mouse (/dev/input/mouse0)
[    29.660] (II) No input driver specified, ignoring this device.
[    29.660] (II) This device may have been added with another device file.
[    29.661] (II) config/udev: Adding input device SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard (/dev/input/event10)
[    29.661] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: Applying InputClass "libinput keyboard catchall"
[    29.661] (II) Using input driver 'libinput' for 'SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard'
[    29.661] (II) systemd-logind: got fd for /dev/input/event10 13:74 fd 51 paused 0
[    29.661] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: always reports core events
[    29.662] (**) Option "Device" "/dev/input/event10"
[    29.662] (**) Option "_source" "server/udev"
[    29.662] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: is tagged by udev as: Keyboard
[    29.662] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: device is a keyboard
[    29.662] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: device removed
[    29.662] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.2/0003:1038:170E.0003/input/input13/event10"
[    29.662] (II) XINPUT: Adding extended input device "SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard" (type: KEYBOARD, id 10)
[    29.662] (**) Option "xkb_model" "pc105"
[    29.662] (**) Option "xkb_layout" "us"
[    29.663] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: is tagged by udev as: Keyboard
[    29.663] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: device is a keyboard
[    29.663] (II) config/udev: Adding input device SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control (/dev/input/event11)
[    29.663] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: Applying InputClass "libinput keyboard catchall"
[    29.663] (II) Using input driver 'libinput' for 'SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control'
[    29.664] (II) systemd-logind: got fd for /dev/input/event11 13:75 fd 52 paused 0
[    29.664] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: always reports core events
[    29.664] (**) Option "Device" "/dev/input/event11"
[    29.664] (**) Option "_source" "server/udev"
[    29.664] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: is tagged by udev as: Keyboard
[    29.664] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: device is a keyboard
[    29.664] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: device removed
[    29.664] (II) libinput: SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: needs a virtual subdevice
[    29.664] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.2/0003:1038:170E.0003/input/input14/event11"
[    29.664] (II) XINPUT: Adding extended input device "SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control" (type: MOUSE, id 11)
[    29.664] (**) Option "AccelerationScheme" "none"
[    29.665] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: (accel) selected scheme none/0
[    29.665] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: (accel) acceleration factor: 2.000
[    29.665] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: (accel) acceleration threshold: 4
[    29.665] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: is tagged by udev as: Keyboard
[    29.665] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: device is a keyboard
[    29.665] (II) config/udev: Adding input device DATACOMP SteelS쀁̄Љ̒DATA (/dev/input/event13)
[    29.665] (**) DATACOMP SteelS쀁̄Љ̒DATA: Applying InputClass "libinput keyboard catchall"
[    29.665] (II) Using input driver 'libinput' for 'DATACOMP SteelS쀁̄Љ̒DATA'
[    29.666] (II) systemd-logind: got fd for /dev/input/event13 13:77 fd 53 paused 0
[    29.666] (**) DATACOMP SteelS쀁̄Љ̒DATA: always reports core events
[    29.666] (**) Option "Device" "/dev/input/event13"
[    29.666] (**) Option "_source" "server/udev"
[    29.667] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: is tagged by udev as: Keyboard
[    29.667] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: device is a keyboard
[    29.667] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: device removed
[    29.667] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0/0003:04B4:0101.0005/input/input16/event13"
[    29.667] (II) XINPUT: Adding extended input device "DATACOMP SteelS쀁̄Љ̒DATA" (type: KEYBOARD, id 12)
[    29.667] (**) Option "xkb_model" "pc105"
[    29.667] (**) Option "xkb_layout" "us"
[    29.668] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: is tagged by udev as: Keyboard
[    29.668] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: device is a keyboard
[    29.668] (II) config/udev: Adding input device DATACOMP SteelS쀁̄Љ̒DATA System Control (/dev/input/event14)
[    29.668] (**) DATACOMP SteelS쀁̄Љ̒DATA System Control: Applying InputClass "libinput keyboard catchall"
[    29.668] (II) Using input driver 'libinput' for 'DATACOMP SteelS쀁̄Љ̒DATA System Control'
[    29.668] (II) systemd-logind: got fd for /dev/input/event14 13:78 fd 54 paused 0
[    29.669] (**) DATACOMP SteelS쀁̄Љ̒DATA System Control: always reports core events
[    29.669] (**) Option "Device" "/dev/input/event14"
[    29.669] (**) Option "_source" "server/udev"
[    29.669] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: is tagged by udev as: Keyboard
[    29.669] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: device is a keyboard
[    29.669] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: device removed
[    29.669] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.1/0003:04B4:0101.0006/input/input17/event14"
[    29.669] (II) XINPUT: Adding extended input device "DATACOMP SteelS쀁̄Љ̒DATA System Control" (type: KEYBOARD, id 13)
[    29.669] (**) Option "xkb_model" "pc105"
[    29.669] (**) Option "xkb_layout" "us"
[    29.670] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: is tagged by udev as: Keyboard
[    29.670] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: device is a keyboard
[    29.671] (II) config/udev: Adding input device DATACOMP SteelS쀁̄Љ̒DATA Consumer Control (/dev/input/event15)
[    29.671] (**) DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: Applying InputClass "libinput keyboard catchall"
[    29.671] (II) Using input driver 'libinput' for 'DATACOMP SteelS쀁̄Љ̒DATA Consumer Control'
[    29.671] (II) systemd-logind: got fd for /dev/input/event15 13:79 fd 55 paused 0
[    29.671] (**) DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: always reports core events
[    29.671] (**) Option "Device" "/dev/input/event15"
[    29.671] (**) Option "_source" "server/udev"
[    29.672] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: is tagged by udev as: Keyboard
[    29.672] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: device is a keyboard
[    29.672] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: device removed
[    29.672] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.1/0003:04B4:0101.0006/input/input18/event15"
[    29.672] (II) XINPUT: Adding extended input device "DATACOMP SteelS쀁̄Љ̒DATA Consumer Control" (type: KEYBOARD, id 14)
[    29.672] (**) Option "xkb_model" "pc105"
[    29.672] (**) Option "xkb_layout" "us"
[    29.673] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: is tagged by udev as: Keyboard
[    29.673] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: device is a keyboard
[    29.673] (II) config/udev: Adding input device HDA Intel PCH Line Out CLFE (/dev/input/event7)
[    29.673] (II) No input driver specified, ignoring this device.
[    29.673] (II) This device may have been added with another device file.
[    29.673] (II) config/udev: Adding input device HDA Intel PCH Front Headphone (/dev/input/event8)
[    29.673] (II) No input driver specified, ignoring this device.
[    29.673] (II) This device may have been added with another device file.
[    29.674] (II) config/udev: Adding input device HDA Intel PCH Front Mic (/dev/input/event2)
[    29.674] (II) No input driver specified, ignoring this device.
[    29.674] (II) This device may have been added with another device file.
[    29.674] (II) config/udev: Adding input device HDA Intel PCH Rear Mic (/dev/input/event3)
[    29.674] (II) No input driver specified, ignoring this device.
[    29.674] (II) This device may have been added with another device file.
[    29.674] (II) config/udev: Adding input device HDA Intel PCH Line (/dev/input/event4)
[    29.674] (II) No input driver specified, ignoring this device.
[    29.674] (II) This device may have been added with another device file.
[    29.674] (II) config/udev: Adding input device HDA Intel PCH Line Out Front (/dev/input/event5)
[    29.674] (II) No input driver specified, ignoring this device.
[    29.675] (II) This device may have been added with another device file.
[    29.675] (II) config/udev: Adding input device HDA Intel PCH Line Out Surround (/dev/input/event6)
[    29.675] (II) No input driver specified, ignoring this device.
[    29.675] (II) This device may have been added with another device file.
[    29.680] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: Applying InputClass "libinput keyboard catchall"
[    29.680] (II) Using input driver 'libinput' for 'SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control'
[    29.680] (II) systemd-logind: returning pre-existing fd for /dev/input/event11 13:75
[    29.680] (**) SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: always reports core events
[    29.680] (**) Option "Device" "/dev/input/event11"
[    29.680] (**) Option "_source" "_driver/libinput"
[    29.680] (II) libinput: SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: is a virtual subdevice
[    29.680] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.2/0003:1038:170E.0003/input/input14/event11"
[    29.680] (II) XINPUT: Adding extended input device "SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control" (type: KEYBOARD, id 15)
[    29.680] (**) Option "xkb_model" "pc105"
[    29.680] (**) Option "xkb_layout" "us"
[    34.613] (--) NVIDIA(GPU-0): CRT-0: disconnected
[    34.613] (--) NVIDIA(GPU-0): CRT-0: 400.0 MHz maximum pixel clock
[    34.613] (--) NVIDIA(GPU-0): 
[    34.618] (--) NVIDIA(GPU-0): DFP-0: disconnected
[    34.618] (--) NVIDIA(GPU-0): DFP-0: Internal TMDS
[    34.618] (--) NVIDIA(GPU-0): DFP-0: 330.0 MHz maximum pixel clock
[    34.618] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): connected
[    34.649] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): Internal TMDS
[    34.649] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): 600.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-2: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-2: Internal DisplayPort
[    34.649] (--) NVIDIA(GPU-0): DFP-2: 960.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-3: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-3: Internal TMDS
[    34.649] (--) NVIDIA(GPU-0): DFP-3: 165.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-4: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[    34.649] (--) NVIDIA(GPU-0): DFP-4: 960.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-5: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-5: Internal TMDS
[    34.649] (--) NVIDIA(GPU-0): DFP-5: 165.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-6: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort
[    34.649] (--) NVIDIA(GPU-0): DFP-6: 960.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    34.649] (--) NVIDIA(GPU-0): DFP-7: disconnected
[    34.649] (--) NVIDIA(GPU-0): DFP-7: Internal TMDS
[    34.649] (--) NVIDIA(GPU-0): DFP-7: 165.0 MHz maximum pixel clock
[    34.649] (--) NVIDIA(GPU-0): 
[    53.649] (**) Option "fd" "45"
[    53.649] (II) event1  - Power Button: device removed
[    53.649] (**) Option "fd" "48"
[    53.649] (II) event0  - Power Button: device removed
[    53.649] (**) Option "fd" "49"
[    53.649] (II) event12 - SteelSeries SteelSeries Arctis 5: device removed
[    53.649] (**) Option "fd" "50"
[    53.649] (II) event9  - SteelSeries SteelSeries Rival 500 Gaming Mouse: device removed
[    53.649] (**) Option "fd" "51"
[    53.649] (II) event10 - SteelSeries SteelSeries Rival 500 Gaming Mouse Keyboard: device removed
[    53.649] (**) Option "fd" "52"
[    53.650] (**) Option "fd" "53"
[    53.650] (II) event13 - DATACOMP SteelS쀁̄Љ̒DATA: device removed
[    53.650] (**) Option "fd" "54"
[    53.650] (II) event14 - DATACOMP SteelS쀁̄Љ̒DATA System Control: device removed
[    53.650] (**) Option "fd" "55"
[    53.650] (II) event15 - DATACOMP SteelS쀁̄Љ̒DATA Consumer Control: device removed
[    53.650] (**) Option "fd" "52"
[    53.650] (II) event11 - SteelSeries SteelSeries Rival 500 Gaming Mouse Consumer Control: device removed
[    53.883] (II) systemd-logind: got pause for 13:76
[    53.883] (II) systemd-logind: got pause for 13:77
[    53.883] (II) systemd-logind: got pause for 13:64
[    53.883] (II) systemd-logind: got pause for 13:73
[    53.883] (II) systemd-logind: got pause for 13:79
[    53.883] (II) systemd-logind: got pause for 13:78
[    53.883] (II) systemd-logind: got pause for 13:65
[    53.883] (II) systemd-logind: got pause for 13:75
[    53.883] (II) systemd-logind: got pause for 13:74

[CatKiller]

You're in good shape. You can see from the log that it's your xorg.conf that's stopping the multimonitor setup. Was it an auto-generated one?

[    27.126] (==) Using config file: "/etc/X11/xorg.conf"
[    27.126] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    27.176] (==) ServerLayout "Layout0"
[    27.176] (**) |-->Screen "Screen0" (0)
[    27.176] (**) |   |-->Monitor "Monitor0"
[    27.189] (**) |   |-->Device "Device0"
[    27.189] (**) |-->Input Device "Keyboard0"
[    27.189] (**) |-->Input Device "Mouse0"
[    27.189] (**) Option "Xinerama" "0"

But both graphics cards and all the monitors seem to be successfully detected and configured.

[    28.550] (--) NVIDIA(0): Valid display device(s) on GPU-0 at PCI:1:0:0
[    28.551] (II) NVIDIA(0): NVIDIA GPU GeForce GTX 980 Ti (GM200-A) at PCI:1:0:0 (GPU-0)
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): connected
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): Internal TMDS
[    28.590] (--) NVIDIA(GPU-0): Pioneer Electronic Corporation VSX-921 (DFP-1): 600.0 MHz maximum pixel clock
[    28.594] (II) NVIDIA(0): Validated MetaModes:
[    28.594] (II) NVIDIA(0):     "nvidia-auto-select+0+0"
[    28.594] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080
[    28.837] (--) NVIDIA(0): Valid display device(s) on GPU-1 at PCI:2:0:0
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): connected
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): Internal TMDS
[    28.860] (--) NVIDIA(GPU-1): HP x23LED (DFP-0): 330.0 MHz maximum pixel clock
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): connected
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): Internal TMDS
[    28.867] (--) NVIDIA(GPU-1): HP W2371d (DFP-3): 330.0 MHz maximum pixel clock
[    28.887] (II) NVIDIA(GPU-1): NVIDIA GPU GeForce GTX 660 Ti (GK104) at PCI:2:0:0 (GPU-1)
[    29.050] (II) NVIDIA(0): Setting mode "nvidia-auto-select+0+0"

Interestingly, you appear to have enough outputs to run all three monitors off the 980 Ti, which would make things easier. I'm not sure that the 660 Ti is bringing anything to the table.

You should have enough there to make a start, I think.

Edit: when you're reading the xorg.conf manpage or the nvidia readme it's worth remembering that the X11 protocol is over 30 years old; not everything that's in there is relevant any more. You'll only need to setup the structure of the thing and let most things be automatically handled. Just so that you aren't sitting there thinking, "what the heck is a RAMDAC?" or similar. Names and the relationship between one thing and another thing is what you're primarily interested in.

Edit 2: it's also worth remembering that 12 monitors and 12 sets of keyboard/mouse independently connected to one machine and 12 GPUs and none of them used for display are both perfectly sensible configurations of a Linux box. There just isn't the scope for a one-size-fits-all zero-configuration option. Whereas with Windows you can only have what Windows gives you.

[xstrada2501]

You're in good shape. You can see from the log that it's your xorg.conf that's stopping the multimonitor setup. Was it an auto-generated one?

Yes, but I have since deleted it and the old log files. Rebooted, no problem. New log files generated.

But both graphics cards and all the monitors seem to be successfully detected and configured.

So why is the 660ti and my 23's still not showing up?

Interestingly, you appear to have enough outputs to run all three monitors off the 980 Ti, which would make things easier. I'm not sure that the 660 Ti is bringing anything to the table.

That is true. It has a DVI port and a bunch of display ports which would require me purchasing a DVI/Display Port adapter cable. But that's not what I want. I want my 660 working and displaying. Which it is not, currently.

[CatKiller]

So why is the 660ti and my 23's still not showing up?

They are; they're right there in the log. But X doesn't know whether you want a different Screen for each monitor, one for each graphic card, one that covers all three (and whether that one uses Xinerama, TwinView, or something else entirely). You need to tell it what you want. It can autoconfigure one monitor for the primary display, which is how your BIOS is set up, because there's only really one way of doing that. Any other configuration relies on your choices.

[xstrada2501]

Ok, so... progress?

I went into XServer and enabled my screens. 40" screen 0 - absolute. 23" screens 1 & 2 - left and right. Fresh xorg file for each config change to avoid copying or overlapping. Both screens are now alive (yay!) - BUT - both are black, cursor is a cross and I cannot drag windows between displays.

Is this the point I enable xinerama and hope for the best or is this where mosaic comes into play?

[CatKiller]

Ok, so... progress?

I went into XServer and enabled my screens. 40" screen 0 - absolute. 23" screens 1 & 2 - left and right. Fresh xorg file for each config change to avoid copying or overlapping. Both screens are now alive (yay!) - BUT - both are black, cursor is a cross and I cannot drag windows between displays.

Is this the point I enable xinerama and hope for the best or is this where mosaic comes into play?

Awesome. Not being able to drag windows between displays is a function of having them as separate screens: they are independent of each other as far as the window manager is concerned.

I think (although I'm hazy) that Xinerama required applications to be aware of it, and most weren't.

As far as I can tell, the nvidia default would be to have a Screen for each GPU, which in your case would mean that windows could be dragged from the right screen to the left, completely bypassing the one in the middle. Not what you want, but pretty funny.

I think that what you want is to have everything defined as one Screen, with a defined meta-mode of (edit: effectively) 5760×1080. It was a long time ago that I played with this stuff, and quite a bit has changed in the meantime. The documentation should specify the options that are available to you.

As I recall, Xinerama was a bit iffy with applications that weren't aware of it, TwinView only works for one GPU, XRandR makes things a lot easier by being able to specify your own stuff (like custom resolutions and having things rotated), and Nvidia like to do their own thing that makes sense to them rather than what anyone else is doing.

I'm glad to hear you're making progress

Edit: Chapter 13 of the Nvidia readme is probably where you should be looking. It describes the syntax of having your meta-mode for the three monitors, and you can do all sorts of neat things where the resolution of the screen is different to the resolution of the monitor, and placed arbitrarily.

[xstrada2501]

Ok, I'm stuck again. This is my xorg.config with black 23" and cross cursor.

# nvidia-settings: X configuration file generated by nvidia-settings# nvidia-settings:  version 390.77  (buildd@lcy01-amd64-022)  Thu Sep  6 07:51:39 UTC 2018


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 1920 0
    Screen      1  "Screen1" LeftOf "Screen0"
    Screen      2  "Screen2" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection


Section "Files"
EndSection


Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection


Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection


Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection


Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Pioneer Electronic Corporation VSX-921"
    HorizSync       14.0 - 70.0
    VertRefresh     48.0 - 62.0
    Option         "DPMS"
EndSection


Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "HP x23LED"
    HorizSync       24.0 - 83.0
    VertRefresh     50.0 - 75.0
    Option         "DPMS"
EndSection


Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor2"
    VendorName     "Unknown"
    ModelName      "HP W2371d"
    HorizSync       24.0 - 94.0
    VertRefresh     50.0 - 76.0
    Option         "DPMS"
EndSection


Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 980 Ti"
    BusID          "PCI:1:0:0"
EndSection


Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 660 Ti"
    BusID          "PCI:2:0:0"
    Screen          0
EndSection


Section "Device"
    Identifier     "Device2"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 660 Ti"
    BusID          "PCI:2:0:0"
    Screen          1
EndSection


Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "DVI-I-1: nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


Section "Screen"
    Identifier     "Screen2"
    Device         "Device2"
    Monitor        "Monitor2"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-3"
    Option         "metamodes" "DVI-D-0: nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

I understand that since the displays are on separate gpu's and are stand alone xscreens window dragging might not work. Although I'd prefer it to be otheerwise, that's ok. I can live with that.

The next step is to get them actually displaying an image or a functioning screen.

Edit: Xinerama is not an option as I tried that, and got a login bootloop. Had to recovery in and delete the xorg file from root. At least I learned how to do that. The pipeline thing doesn't work either and I have no option for Twinview.
So, yeh. I'm stuck.

[CatKiller]

So interestingly Nvidia changed the chapter numbering between the version of the readme I linked to earlier and the version I was having a look at on my phone. So, for the version I linked to before, it's Chapter 12: Configuring Multiple Monitors On One X Screen. So, apologies if that caused any confusion.

With your login issue, desktop environments store their own configuration for the desktop resolution in ~/.config/monitors.xml. If the configuration changes suddenly (because, for example, the monitor has disappeared and been replaced by one three times the size that uses Xinerama) things can get confused. Since you're using X and Nvidia to fiddle around with the resolution you don't actually care what that file says: it can safely be deleted if it's causing trouble, and it can be recreated at will.

Just as a sanity check: you are aware that the Nvidia driver comes with its own configuration tool in addition to Gnome's Monitor settings, yes? The Monitors setting is quite limited compared to what you're trying to achieve.

Your xorg.conf has a bunch of stuff that you don't need to specify; I guess because it came from nvidia-xconfig initially. And it's in a weird order, for the same reason. So all the module stuff and input stuff you won't need (and these days you can get away with having just snippets in xorg.conf.d to configure those rather than having a full xorg.conf, which is nice: I no longer need the whole shebang just to turn off mouse acceleration). The names are also very much machine-generated, which makes it hard to read. It doesn't actually matter what you call things, as long as it's consistent.

So something like

Section "Monitor"
    Identifier     "VSX-921"
EndSection

Section "Monitor"
    Identifier     "x23LED"
EndSection

Section "Monitor"
    Identifier     "W2371d"
EndSection

Section "Device"
    Identifier     "980-DFP-1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 980 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "660-DFP-0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 660 Ti"
    BusID          "PCI:2:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "660-DFP-3"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 660 Ti"
    BusID          "PCI:2:0:0"
    Screen          1
EndSection

Should be fine for those bits. That leaves just the Screen and (possible) ServerLayout sections that tie them all together.

Using a meta-mode to span all three monitors is something that Nvidia call "Dynamic TwinView" because marketing. It's possible that you won't even need to define a Screen Section: you might be able to put the MetaMode in the Device Sections. There is also the option of having a Modes Section with the same structure as the other Sections: Section "Modes" followed by what you want in it followed by EndSection. It's also possible that because the GPUs are dissimilar and aren't connected by SLI, it won't work at all. We'll see

As far as I can tell, the MetaMode you're after would be something like

   Option    "MetaModes"    "GPU-1.DFP-0: nvidia-auto-select, GPU-0.DFP-1: nvidia-auto-select, GPU-1.DFP-3: nvidia-auto-select"

I need to stop for now, but I'll check back with how you're doing later.

[xstrada2501]

CatKiller, thankyou so much for all your help, expertise and suggestions.

I wish I had better news, but I've decided to give up. I just cannot get any configuration to behave and my 980 has been throwing hissy fits and flickering over to a magenta screen. Over heating issue? Maybe. It has happened before but it's so random and I thought I had it figured out after a BIOS update pre all this, but all this tinkering has caused it to happen again.

I'll go back to my previous statement of not wanting to poke this bear.

I don't game on Ubuntu, so the need for the extra screens is not really there. Plus I can plug one of my monitors into the DVI socket on my 980 with no issues if I need another monitor - which is frequently. I just wish I didn't have to do that.

Again, thankyou so very, very much for all you have done.

[CatKiller]

No problem; happy to help, and I expect that you've got a lot more confident with tinkering with your machine with this process even though you ultimately didn't manage to scratch the particular itch.

I do have some longer term good news for you, though.

When Optimus - pairing integrated Intel graphics with Nvidia graphics in laptops - first appeared, Nvidia weren't at all interested in making it work on Linux; they said it was Windows-only technology. With the proprietary nature of the driver, and the state of both X and OpenGL at the time the community came up with their own solutions, but they were a bit clunky. However, with the creation of Vulkan and Wayland, and using GPUs for computation, and developments in DirectX (which steers Nvidia's driver development, even on Linux) they're revisiting that decision. Work is being done on no longer treating GPUs as framebuffers to be written into, but instead being able to add generic combinations of graphics cards in more arbitrary configurations. You probably saw references to MultiGpu in the documentation and the logs: that's what that's about.

So what you've been trying to do here - addressing two quite different GPUs at the same time - should be quite a lot easier in the future if you decide to revisit it.