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I have a cluster of machines running on Ubuntu 10.04 LTS that are equipped with two graphic cards, a NVidia GeForce GT 240 (secondary) and a Matrox one (primary). Because it just seems to ignore the Matrox graphics card, nvidia-xconfig does not deem necessary to add a BusID field in my /etc/X11/XF86Config file, and I need to add it manually. Given that the BusID field changes from machine to machine, I'd be happy that nvidia-xconfig does the job automatically.

Is that possible to force nvidia-xconfig to specify the proper BusID in that particular case? Note that using the option --enable-all-gpus does not work!

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Could you please provide your xorg.conf? This would really help me configuring my two cards. – Damian Nowak Mar 9 '11 at 22:20
@Damian: here you go! – Greg Mar 11 '11 at 9:16
Looks like that's an answer you've posted in your question? Edit it out and pop it as an answer then accept it! – PriceChild Jul 14 '11 at 15:24
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What I came up with as a fix is to use nvidia-xconfig --query-gpu-info to obtain the BusID, and then feed it again to nvidia-xconfig to update the XF86Config file. Here is the script line that does that:

nvidia-xconfig --connected-monitor="CRT" --busid=`nvidia-xconfig --query-gpu-info | grep BusID | sed 's/PCI BusID : PCI:/PCI:/'`

Finally, my XF86Config file looks like this:

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection


Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GT 240"
    BusID          "  PCI:5:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "ConnectedMonitor" "CRT"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
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