Bug#572754: linux-image-2.6.33-2-amd64: Xorg / virtual console switching glitch with KMS on i915

[Stephen Kitt <steve@sk2.org>]

On Sat, 06 Mar 2010 19:57:44 +0800, Paul Wise <pabs@debian.org> wrote:
> While I am currently running 2.6.33-2, I also have this problem with
> 2.6.32-8. The issue is that when I switch from Xorg to a virtual
> console, wait some seconds and then switch back to Xorg, for about 0.5
> seconds I see what was on the screen before I switched away from Xorg,
> then the screen flashes and gets updated by Xorg. Usually when it gets
> updated the screensaver has kicked in. I would expect that when
> switching back to Xorg I'd see the screensaver instead of a flash of my
> desktop. I also wonder if this could be a minor information disclosure
> security issue. As you can see below, I have an i915-based Intel GPU,
> which defaults to using KMS. I didn't have this issue before i915 was
> switched to using KMS by default.

This happens to me too, on 2.6.32 and 2.6.33, with a Radeon X800GT and a
Radeon HD 4650 (both using KMS).

Regards,

Stephen