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-   -   Can't get One Desktop on Multiple GPUs (http://www.nvnews.net/vbulletin/showthread.php?t=101640)

bpat1434 11-03-07 03:22 PM

Can't get One Desktop on Multiple GPUs
 
Hello all!!

I'm trying to get my GeForce 8600 GT graphics cards (yes, two SLI ready PCIe x16) to give me one large desktop display rather than two X screens.

I'd rather not use Xinerama as compiz-fusion doesn't work under it, and if I try to use TwinView it doesn't seem to work. I've manually edited my xorg.conf file, and I've had the nvidia-xconfig as well as nvidia-settings create a xorg.conf file and still it won't give me what I want.

I have talked to people on IRC that say it can be done, and someone pointed out that they had 4 monitors across two cards. So I must be missing something. Can anyone see why I would be getting two X desktops instead of one large desktop in my xorg.conf? I'm completely lost here.

Code:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildmeister@builder26)  Wed Sep 12 14:29:53 PDT 2007


Section "ServerLayout"
        Identifier        "Layout0"
        screen 0        "Screen0" 0 0
        screen 1        "Screen1" RightOf "Screen0"
        Inputdevice        "Keyboard0"        "CoreKeyboard"
        Inputdevice        "Mouse0"        "CorePointer"
EndSection

Section "Files"
        Rgbpath                "/usr/X11R6/lib/X11/rgb"
EndSection

Section "Module"
        Load                "extmod"
        Load                "type1"
        Load                "freetype"
        Load                "glx"
        Load                "v4l"
EndSection

Section "ServerFlags"
        Option                "Xinerama"        "False"
EndSection

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

Section "InputDevice"
        Identifier        "Keyboard0"
        Driver                "kbd"
EndSection

Section "Monitor"
        Identifier        "Monitor0"
        Vendorname        "Acer"
        Modelname        "Acer AL1916W"
        Horizsync        30.0-82.0
        Vertrefresh        56.0-76.0
        modeline        "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
        modeline        "640x480@72" 31.5 640 664 704 832 480 489 491 520 -vsync -hsync
        modeline        "640x480@75" 31.5 640 656 720 840 480 481 484 500 -vsync -hsync
        modeline        "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
        modeline        "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
        modeline        "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
        modeline        "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
        modeline        "832x624@75" 57.284 832 864 928 1152 624 625 628 667 -vsync -hsync
        modeline        "1024x768@75" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
        modeline        "1024x768@70" 75.0 1024 1048 1184 1328 768 771 777 806 -vsync -hsync
        modeline        "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
        modeline        "1152x864@75" 108.0 1152 1216 1344 1600 864 865 868 900 +hsync +vsync
        modeline        "1280x1024@75" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
        modeline        "1280x960@60" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync
        modeline        "1280x1024@60" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
        modeline        "1280x960@75" 129.86 1280 1368 1504 1728 960 961 964 1002 -hsync +vsync
        modeline        "1400x1050@60" 122.61 1400 1488 1640 1880 1050 1051 1054 1087 -hsync +vsync
        modeline        "1400x1050@75" 155.85 1400 1496 1648 1896 1050 1051 1054 1096 -hsync +vsync
        modeline        "1600x1200@65" 175.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
        modeline        "1600x1200@60" 162.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
        Gamma        1.0
EndSection

Section "Monitor"
        Identifier        "Monitor1"
        Vendorname        "Samsung"
        Modelname        "Samsung SyncMaster 910T"
        modeline        "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
        modeline        "640x480@72" 31.5 640 664 704 832 480 489 491 520 -vsync -hsync
        modeline        "640x480@75" 31.5 640 656 720 840 480 481 484 500 -vsync -hsync
        modeline        "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
        modeline        "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
        modeline        "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
        modeline        "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
        modeline        "832x624@75" 57.284 832 864 928 1152 624 625 628 667 -vsync -hsync
        modeline        "1024x768@75" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
        modeline        "1024x768@70" 75.0 1024 1048 1184 1328 768 771 777 806 -vsync -hsync
        modeline        "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
        modeline        "1152x864@75" 108.0 1152 1216 1344 1600 864 865 868 900 +hsync +vsync
        modeline        "1280x1024@75" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
        modeline        "1280x960@60" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync
        modeline        "1280x1024@60" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
        modeline        "1280x960@75" 129.86 1280 1368 1504 1728 960 961 964 1002 -hsync +vsync
        modeline        "1400x1050@60" 122.61 1400 1488 1640 1880 1050 1051 1054 1087 -hsync +vsync
        modeline        "1600x1200@65" 175.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
        modeline        "1600x1200@60" 162.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
        Gamma        1.0
EndSection

Section "Device"
        Identifier        "Videocard0"
        Boardname        "GeForce 8600 GT"
        Busid                "PCI:1:0:0"
        Driver                "nvidia"
        Screen        0
EndSection

Section "Device"
        Identifier        "Videocard1"
        Boardname        "GeForce 8600 GT"
        Busid                "PCI:4:0:0"
        Driver                "nvidia"
        Screen        0
EndSection

Section "Screen"
        Identifier        "Screen0"
        Device                "Videocard0"
        Monitor                "Monitor0"
        Defaultdepth        24
        Option                "AddARGBVisuals"        "True"
        Option                "AddARGBGLXVisuals"        "True"
        Option                "AllowGLXWithComposite"        "True"
        Option                "RenderAccel"                "True"
        Option                "TwinView"                "True"
        Option                "metamodes"                "1400x1050_75 +0+0; nvidia-auto-select +0+0"
        SubSection "Display"
                Depth        24
                Modes        "1024x768@75" "1024x768@70" "1024x768@60" "1280x1024@75" "1280x960@60" "1280x1024@60" "1280x960@75" "1400x1050@60" "1400x1050@75"
        EndSubSection
EndSection

Section "Screen"
        Identifier        "Screen1"
        Device                "Videocard1"
        Monitor                "Monitor1"
        Defaultdepth        24
        Option                "AddARGBVisuals"        "True"
        Option                "AddARGBGLXVisuals"        "True"
        Option                "RenderAccel"        "True"
        Option                "AllowGLXWithComposite"        "True"
        Option                "TwinView"        "True"
        Option                "metamodes"        "1600x1200_60 +0+0; 1280x1024_60 +0+0; nvidia-auto-select +0+0"
        SubSection "Display"
                Depth        24
                Modes        "1600x1200@65" "1600x1200@60" "1400x1050@60" "1280x960@75" "1280x1024@60" "1280x960@60" "1280x1024@75" "1024x768@60" "1024x768@70" "1024x768@75"
        EndSubSection
EndSection

Section "Extensions"
        Option                "Composite"        "Enable"
        Option                "RandRRotation"        "Enable"
EndSection

Thanks for any help you can offer me.

zander 11-03-07 03:33 PM

Re: Can't get One Desktop on Multiple GPUs
 
You need to use Xinerama to get one logical X screen spanning two independent physical X screens. TwinView screens can not span GPUs.


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