Re: [Xen-users] ï[Xen-devel] Xen VGA Passthrough - GTX 680 successfully ïhard-moded to GRID K2

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Wed, 25 Sep 2013 16:10:23 +0100 (BST), David TECHER 
<davidtecher@xxxxxxxx> wrote:
> Gordan,
>
> > Let me recap the problem. I only get this on the GTX680
>  >(Quadrified to K5000 or Gridified to K2, happens in both
>  >cases) in domU. It does NOT happen with a GTX470/480 modified
>  >to Q5000/Q6000. On bare metal the modified GTX680 works fine,
>  >the issue does not arise. I only tried this on XP64, not
> > attempted on Win7.
> "DL-DVI" for me means Dual Link DVI.
> Yes I have a DL-DVI capable monitor (Resolution: 2560x1440). I don't
> have monitor with Resolution = 2560x1600
>
> Using
> - my DL-DVI monitor( = the Dual Link connector on my graphic card
> GTX680 is connected through a Dual Link cable to my DL-DVI montior)
> -my GTX 680 gridified to K2
> - high resolutions (2560x1440)
>
> my domU XP64 is able to boot properly. High resolutions is taken into
> account
Right, OK. So you can achieve the DL-DVI mode without problems on your
setup. Which means the problem isn't universally applicable to
Xen 4.3.0 + modified GTX680 + XP64 domU. Which begs the question of
what is different about my setup...

> To avoid any misunderstanding I added a short youtube video where my
> configuration file is printed out and where the domU XP 64 is 
> started,
> shutdown. After that the domU XP64 is restarted.
>
> http://youtu.be/UgIuPED-h44
>
> No black screen when the domU is started.
The issue on my setup isn't about _starting_ the domU - if I get
the domU started in low-res mode, changing to a higher res-mode
puts the monitor to sleep. When the confirmation dialog box times
out, it reverts back to original low-res mode, and the monitor
wakes up again.

> > Hang on - are you saying that once the Nvidia driver is installed
>  >you can use gfx_passthry=1 an you get the SeaBIOS output and the
>  >boot-up Windows animaption on the domU monitor, rather than on
>  >the VNC console? Is your passthrough GPU the primary in dom0?
>
> With gfx_passthru = 1 the boot-up Windows animation is on the VNC
> console.
I _may_ be wrong here, but doesn't the gfx_passthru=1 get ignored
in that case? If it was working, the BIOS level and bootup output
should come up on the passthru GPU, should it not? I guess
gfx_passthru=1 just disables the emulated Cirrus VGA, but in that
case the boot-up animation shouldn't show up on VNC.

So I'm not sure what is going on in this case.

Gordan

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