From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xensource.com>
Subject: Re: [PATCH 0/4] rest of xen host s3 patches
Date: Thu, 19 Jul 2007 11:07:00 +0100
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To: "Tian, Kevin" <kevin.tian@intel.com>
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On 19/7/07 11:01, "Tian, Kevin" <kevin.tian@intel.com> wrote:

> One comment from you is held, that acpi sleep option
> (s3_bios/s3_mode) is still required to be passed from dom0, since
> VGA has been given to dom0 only which knows the VGA mode before
> sleep.

But Xen set the mode in the first place. If dom0 changed it subsequently, by
means unknown to Xen, then dom0 can re-set that mode on wakeup. The most you
should need at the Xen interface is a 'don't-touch-video-state' boolean
flag. What if dom0 has installed a gfx driver that bashes the hardware
directly?

 -- Keir