Comment 1 for bug 1678466

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Alex Williamson (alex-l-williamson) wrote :

It's highly likely that a 7-series GeForce has a different BAR layout than a modern card and should be considered unsupported. Is the "similar card in another slot" also a 7-series or older card? Out of curiosity, add another -v to the lspci output (lspci -vv) so that it identifies which BARs are which. A more modern card looks like this:

 Region 0: Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
 Region 1: Memory at e0000000 (64-bit, prefetchable) [size=256M]
 Region 3: Memory at f0000000 (64-bit, prefetchable) [size=32M]
 Region 5: I/O ports at e000 [size=128]
 Expansion ROM at f7000000 [disabled] [size=512K]

Thus the quirk should be triggered on the I/O port BAR, which your card doesn't seem to have.