HowTO: Setup Twin Graphics Cards

Some people I have been supporting use twin view with two NViDIA graphics cards. While this is perfectly fine, you may run into problems if your xorg.conf file is setup to handle only one card.

Such a setup will look like this when you go to edit the xorg.conf file.

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"

To work around the issue, it is best advised to remove the secondary card from the computer, boot up and acquire the output of the following.

lspci | grep VGA

and you should see something like this:

04:00.0 VGA compatible controller: nVidia Corporation GeForce 9800 GX2

Make a note of the Bus ID of the card (04:00.0) , and edit the xorg.conf file.

sudo nano /etc/X11/xorg.conf

Scroll to the Device section and add the Bus ID to the conf file, except remove all leading zeros, replace the period with a colon, and add ‘PCI’ as a prefix.
So, our example of 04:00.0 becomes:

Section "Device"
    BUSID          "PCI:4:0:0"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"

After doing this, save the file, then shutdown the workstation and reinsert the second GFX card back into the machine.



About ibuclaw
An avant developer and support analyst.

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