Xinerama issues.

[pingaan]

Hi,

I can't seem to get three screens running..
I've activated Seperate X screen on every display and Xinerama is activated.

I'm running a (Asus) Geforce GTX 295 on a Asus PT6 Deluxe V2 mother board, Ubuntu 11.10 x64.
Note that the GTX 295 is actually two GTX 265 merged, so it's sort of an SLI, only not (?)..
The screen I'm having problem activating is the one on the second GPU, the one running on the HDMI out. A TV is connected to the HDMI out, btw..
I have no problem running Twinview on the two DVI out's on the main (or first) GPU.

The ruesult I'm getting is a mirror of the main screen on the other two, but only one screen where the icons are clickable.. The launch bar, however, is not clickable on any screen..

This is my xorg.conf:

# nvidia-settings: X configuration file generated by nvidia-settings  
# nvidia-settings:  version 280.13  (buildd@allspice)  Thu Aug 11 20:54:45 UTC 2011


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

Section "Files" 
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      "Samsung SyncMaster"
    HorizSync       30.0 - 75.0
    VertRefresh     56.0 - 61.0
    Option         "DPMS"
EndSection

Section "Monitor" 
    Identifier     "Monitor2"
    VendorName     "Unknown"
    ModelName      "Samsung SyncMaster"
    HorizSync       30.0 - 75.0
    VertRefresh     56.0 - 61.0
EndSection

Section "Monitor" 
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "SAMSUNG"
    HorizSync       26.0 - 81.0
    VertRefresh     24.0 - 75.0
EndSection

Section "Device" 
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 295"
    BusID          "PCI:5:0:0"
    Screen          0
EndSection

Section "Device" 
    Identifier     "Device2"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 295"
    BusID          "PCI:5:0:0"
    Screen          1
EndSection

Section "Device" 
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 295"
    BusID          "PCI:4:0:0"
EndSection

Section "Screen" 

# Removed Option "TwinView" "1" 
# Removed Option "metamodes" "DFP-0: nvidia-auto-select +1920+0, DFP-1: nvidia-auto-select +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "DFP-0: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen" 
    Identifier     "Screen2"
    Device         "Device2"
    Monitor        "Monitor2"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP-1: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen" 
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection 

I'm hoping someone can help me out..

Best regards.

[bshosey]

Add this to the end of your xorg.conf

Section "Extensions"
Option "Composite" "Disable"
EndSection

[pingaan]

Ahh.. Works like a charm! Can't thank you enough.. ^_^
Now one thing that was there before remains; composite is the HW accelerated desktop stuff, I guess? Anyway to get it running with that enabled? :O

Thanks again!

edit: I mean, is there some other commando I should add the the conf?
I haven't tried simply enabling composite yet, had just enough time to try this out..

[bshosey]

At one time this was possible. But due to the discontinuation of the xorg-server-gxl no. But in the future this will be fixed. I am not sure when but I have been told this is being worked on. This is not an ubuntu issue. This is an actual xorg issue. I use Debian and I have Debian set up to use Separate X Screens and works great but can not drag apps from one monitor to the other. I actually prefere that. But in ubuntu unity will not work right for me with this configuration.

[pingaan]

Hmm.. If that's true it sucks..
But it can't be? I mean, there are uploaded videos on people running up to six screens with a HW desktop on youtube..

I did try simply enabling it but the results were back to the orignal state; mirror on every screen..

Any more ideas to what might be a solution?

Regards.

[bshosey]

Those videos are system with the last version of xserver-glx.

[pingaan]

I don't get it.. Are you saying that they're using the latest or the previous version in the videos?
If it's the latest then fixing this problem should be possible or in the other case just do a downgrade and it should work?? :<

[bshosey]

OK. xgl server and xorg at one time two different projects. Then I guess in a way they merged the two projects. Every sense the merger this feature is not working. Now I am sure this is just temporary. For what I understand this happened in 2009. Now this is is just the understanding I have. But there is another problem. On most distros you can set separate x screens then you would have 3d effects on all monitors but can not drag stuff from one to the others. The problem with this is that unity will not load on multiple monitors. Now this may be just on some systems but every time I have tried this been a no go.

Now if you try to use old xgl server you may run in to compatibility problem. May also have to use older drivers. Could conflict with kernel.

please understand I am not a developer. I am just a GNU/Linux user. I use Debian Squeeze for desktops and ubuntu on a new laptop.
Desktop and Laptop both have nvidia video. Debian Squeeze will not enable 3d effects in separate Xinerama as well.

All that I have found out about this I got from the web.

[pingaan]

Alright, cheers!
I really appreciate you taking the time to explain this to a novice user..
Let's hope they do take the development a bit further!

[bshosey]

I am sure they will. Plus I believe ubuntu also are developing for this as well for what I understand