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Re : [Xen-users] General questions about VGA passthrough

> Date: Sat, 15 Oct 2011 13:03:10 +0200
> From: Francesco Cat <heartcollector87@xxxxxxxxx>
> Subject: Re: Re : [Xen-users] General questions about VGA passthrough
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID:
>        <CAO9ZT02yJXNyOidPm+XS8yUTN6xymSqsEiK3MEGdpvMiQtPPtw@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
> 2011/10/12 Francesco Cat <heartcollector87@xxxxxxxxx>
> Another question, this time it should be rather easy.
> If I have 2 VGAs, and I manage to pass one to the DomU (Secondary adapter
> passthrough should be doable for Xen >= 4.0 right? but that's not important)
> can I still use a VNC connection to the DomU? I hope the answer is yes, but
> I prefere asking since something strange might get in the way and cause
> problems perhaps.

With normal PCI passthrough (VGA passthrough is definitely a no),
theoretically yes. But for some reason for my setup with ATI graphics
cards, the VNC display stops updating as soon as the login window
appears. Tablet input still works and I can disconnect and reconnect;
the display just stops at the "Starting Windows" part.

In device manager, the "Standard VGA Graphics Adapter" has the status
"Windows has stopped this device because it has reported problems.
(Code 43)".

Seems like the ATI drivers are doing something funny. Other than that,
I can get the pre-boot BIOS screen and even control the bootloader and
startup recovery over VNC.

Hope this is the information you need!

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