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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:

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

- 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

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.


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

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.


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