hi all!
I have tried to setup a workstation with 3 monitors on two ati videocards, the goal being to span the desktop across all of them.
The process was not difficult at all, but after login X11 crashes and I am left with a console. I am fortunately able to login in safe mode, but I would like to ask for help in debugging this issue.
Here I will try to give as much detail as possible, starting with my system specifications:
The first card, the ATI Radeon HD 4650 is capable of running two monitors at the same time.Code:matteo@matteo-desktop:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.04 Release: 11.04 Codename: natty matteo@matteo-desktop:~$ uname -mrs Linux 2.6.38-10-generic x86_64 matteo@matteo-desktop:~$ matteo@matteo-desktop:~$ lspci|grep VGA 04:00.0 VGA compatible controller: ATI Technologies Inc RV730 PRO [Radeon HD 4650] 05:00.0 VGA compatible controller: ATI Technologies Inc Cedar PRO [Radeon HD 5450]
The monitors, for all it matters, are three identical ACER P206HV 20" connected with their analog interface (due to missing cableswhich I will buy soon). Resolution 1600x900 each.
My motherboard is an AsRock 870 Extreme3 mounting an AMD Athlon II X4 640 3 GHz processor and 8 GB of RAM.
When asked by Ubuntu, I installed the ATI Caralyst driver version 11.6 and set it up for using Xinerama.
As I said, this setup works fine if I login in safe mode, but crashes X11 otherwise (even in classical mode - no Unity). By inspecting the logs (attached) I found this (notice the segfault)
As a test, I tryed to configure Catalyst without Xinerama, an this works, but of course I end up with two separate desktop, which is not what I want.Code:[...] [ 1937.756] (II) fglrx(0): Restoring Recent Mode via PCS is not supported in RANDR 1.2 capable environments [ 1937.756] (II) fglrx(1): Restoring Recent Mode via PCS is not supported in RANDR 1.2 capable environments [ 1946.647] Backtrace: [ 1946.647] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2656] [ 1946.647] 1: /usr/bin/X (0x400000+0x621ca) [0x4621ca] [ 1946.647] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f6e0fa9d000+0xfc60) [0x7f6e0faacc60] [ 1946.647] 3: /usr/bin/X (0x400000+0xb9ab4) [0x4b9ab4] [ 1946.647] 4: /usr/bin/X (0x400000+0x2e2a9) [0x42e2a9] [ 1946.647] 5: /usr/bin/X (0x400000+0x21a7e) [0x421a7e] [ 1946.647] 6: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xff) [0x7f6e0e9e6eff] [ 1946.648] 7: /usr/bin/X (0x400000+0x21629) [0x421629] [ 1946.648] Segmentation fault at address 0x4 [ 1946.648] Caught signal 11 (Segmentation fault). Server aborting [ 1946.648] Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 1946.648] Please also check the log file at "/var/log/Xorg.0.log" for additional information. [ 1946.648] [ 1946.780] (II) Power Button: Close [ 1946.780] (II) UnloadModule: "evdev" [ 1946.780] (II) Unloading evdev [ 1946.780] (II) Power Button: Close [ 1946.780] (II) UnloadModule: "evdev" [ 1946.780] (II) Unloading evdev [ 1946.790] (II) sonixj: Close [ 1946.790] (II) UnloadModule: "evdev" [ 1946.790] (II) Unloading evdev [ 1946.801] (II) Logitech USB Optical Mouse: Close [ 1946.801] (II) UnloadModule: "evdev" [ 1946.801] (II) Unloading evdev [ 1946.810] (II) AT Translated Set 2 keyboard: Close [ 1946.810] (II) UnloadModule: "evdev" [ 1946.810] (II) Unloading evdev [ 1946.810] (II) AIGLX: Suspending AIGLX clients for VT switch [ 1946.810] (II) fglrx(0): Backup framebuffer data. [ 1946.811] (II) fglrx(0): Backup complete. [ 1947.345] (II) AIGLX: Suspending AIGLX clients for VT switch [ 1947.345] (II) fglrx(1): Backup framebuffer data. [ 1947.346] (II) fglrx(1): Backup complete. [ 1947.398] ddxSigGiveUp: Closing log
In this mode, xrandr seems to work correctly
After some research I found that XRandR does not support desktop spanning over multiple GPUs, so Xinerama is the only way to go in my case. Since the two are not compatible with each other, after login in safe mode I see that XRandR is disabledCode:Screen 0: minimum 320 x 200, current 3200 x 900, maximum 3200 x 3200 DFP1 disconnected (normal left inverted right x axis y axis) DFP2 disconnected (normal left inverted right x axis y axis) CRT1 connected 1600x900+1600+0 (normal left inverted right x axis y axis) 443mm x 249mm 1600x900 59.9*+ 1152x864 60.0 + 75.0 1440x900 59.9 1280x800 60.0 1280x768 59.9 1280x720 60.0 1024x768 75.0 70.1 60.0 800x600 72.2 75.0 70.0 60.3 56.2 720x480 60.0 640x480 75.0 72.8 60.0 CRT2 connected 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm 1600x900 59.9*+ 1152x864 60.0 + 75.0 1440x900 59.9 1280x800 60.0 1280x768 59.9 1280x720 60.0 1024x768 75.0 70.1 60.0 800x600 72.2 75.0 70.0 60.3 56.2 720x480 60.0 640x480 75.0 72.8 60.0 TV disconnected (normal left inverted right x axis y axis) CV disconnected (normal left inverted right x axis y axis)
One more test consisted in disabling the XRandR module in the config files, as found in some posts:Code:matteo@matteo-desktop:~$ xrandr -v xrandr program version 1.3.4 RandR extension missing
edits in /etc/X11/xorg.conf
configuring the ati driver:Code:[...] Section "ServerFlags" Option "RandR" "off" Option "Xinerama" "on" EndSection [...] Section "Device" Option "EnableRandR12" "false" Identifier "aticonfig-Device[0]-0" Driver "fglrx" Option "DesktopSetup" "horizontal" Option "OverlayOnCRTC2" "1" Option "Monitor-CRT1" "0-CRT1" Option "Monitor-CRT2" "0-CRT2" BusID "PCI:4:0:0" EndSection Section "Device" Option "EnableRandR12" "false" Identifier "aticonfig-Device[1]-0" Driver "fglrx" Option "Monitor-CRT2" "1-CRT2" BusID "PCI:5:0:0" EndSection [...]
but this did not help.Code:sudo aticonfig --set-pcs-str="DDX,EnableRandR12,FALSE"
So now I am wondering which other cause can the segfault have.
Any help would be greatly appreciated!
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