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I switched the second GPU in one of our servers (Ubuntu 12.04.1 LTS). But now lspci only gives one entry:

$lspci | grep -i nvidia
04:00.0 VGA compatible controller: NVIDIA Corporation G94 [Quadro FX 1800] (rev a1)

I already executed sudo update-pciids and re-installed the nvidia dev driver. What other steps can I do?

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Why does a server need two graphics cards? – jordanm Dec 4 '12 at 15:08
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for GPGPU Computing aka CUDA and OpenCL – Framester Dec 4 '12 at 15:16
@Framester How about output of lspci | grep -i vga? – Karlson Dec 4 '12 at 16:09
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Are you sure this isn't a hardware issue? E.g., is the card fully seated, does the card work, does the slot, did you plug in the power connector... ? – derobert Dec 4 '12 at 16:21
Is the second on-board or another discrete PCB? If it is on-board, it probably disabled itself. – Aaron D. Marasco Dec 5 '12 at 0:35
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1 Answer

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Could be a hardware issue: The card isn't fully seated, you didn't plug in a cable (power, etc.), the card is defective, the slot is defective, there is some dust in the slot.

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