[vfio-users] [BUG, HELP NEEDED] No signal (Invalid ROM) with some Asus Nvidia cards

[Ben J]

Are you running any graphics drivers on the host system at all? If so, try
blacklisting all of them and launching your VM from the system's base
graphics. I've had this error and it seems to be caused by the driver for a
different card somehow claiming it. Even if you have the card claimed by
vfio it's still possible for it to interfere.
On Feb 16, 2016 2:37 PM, "Nicolas Roy-Renaud" <
nicolas.roy-renaud.1 at ens.etsmtl.ca> wrote:

> I've been wanting to report this one for a while, but I was hoping I could
> gather some more information first to have a clear idea of what's wrong.
> Hopefully some people on the mailing list will be able to help us solve
> this.
>
> The guest GPU I'm using on my current VFIO machine is an Asus-made GTX 970
> (GTX970-DC2OC-4GD5). Although the BIOS is supposed to support UEFI (none of
> those on TechPowerUp do, but running GPU-Z on a base-metal Windows install
> proves mine actually does), whenever I try to perform a firmare dump from
> linux with the vfio driver or boot a VM that should claim this card, I get
> an "Invalid ROM contents" error. Last month, someone else came here
> asking about a similar issue, and I realized after asking a few questions
> that he was trying to pass an Asus-made GTX 750 (GTX750TI-PH-2GD5). As it
> turned out, he was experiencing the exact same issue I had before and
> managed to work around it using the same procedure.
>
> As it turns out, the problem can be avoided when mounting the card on a
> live VM, which somehow bypasses the ROM check and runs without a hitch on
> my machine.
>
> This has me believe that it might be a problem that's specific to Asus
> cards (and perhaps only their Nvidia cards or even just their Maxwell
> cards), but I'm not sure where the problem could possibly come from and
> whether it's related to vfio itself or if it's an issue on Asus' end.
> Either way, I'd need help from someone who's more familiar with vfio than I
> am to help diagnose the issue, or possibly someone else with the same isue
> so we could evaluate how widespread the problem actually is.
>
> _______________________________________________
> vfio-users mailing list
> vfio-users at redhat.com
> https://www.redhat.com/mailman/listinfo/vfio-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/vfio-users/attachments/20160216/bc5f021b/attachment.htm>