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



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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