[Xen-users] VGA Pass-Through: Video Card Sleep on Shutdown?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I know I'm asking a lot of questions these days, but I'm pretty excited about 
some of these new features in Xen 4.

The VGA Pass-Through is great, however, when the domU is shut down, the video 
card is still "active" and I get a bunch of display artifacts on the screen.  I 
was wondering if there's a way to tell the video card to go to sleep, or 
something similar, when the domU is shut down - change the power state, 
something like that.  Or alternatively, have it refresh with information from 
dom0?

I'm hoping to be able to set up some desktop machines that are running Xen in a 
transparent fashion to the end-user - that is, all the end user sees is the 
BIOS screen, the Windows HVM domU boot screen, etc.  I've already switched the 
power button functionality on my Linux distribution such that the power button 
does either an "xm start <domU>" or an "xm shutdown <domU>" rather than 
actually controlling the power state of the physical machine.  Getting the 
video card to behave a little bit better once the domU is shut down would be 
one of a couple of finishing touches on this sort of transparent setup, where 
Xen is being run and the user doesn't know/care.

Thanks - Nick



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