Bug#596356: [Arrandale] xserver-xorg-video-intel: GPU seems to hang
On Fr, 2010-09-10 at 18:32 +0200, Julian Andres Klode wrote:
> Package: xserver-xorg-video-intel
> Version: 2:2.12.0+legacy1-1
> Severity: important
>
> On my ThinkPad Edge 15" with Intel Core i5 430 M (Arrandale)
> integrated graphics, my screen repeatedly turns black, and
> even switching terminals does not help anymore, it remains
> black. The screen can be restored by restarting X; for
> example, via SSH or by blindly typing it into a terminal.
>
> While the system has always been a bit unstable since the
> beginning, I cannot remember to have such lockups in the
> beginning which may indicate that the UMS reintegration
> may be the cause of the issue.
>
> It also seems to be the case that this only happens after
> screensaver activity (which is set to show a blank, black
> screen), although I can't give any guarantee about this.
>
> I am attaching the X log and the output of intel_gpu_dump
> for the hanging session.
Some further input from a second crash:
* Broken X runs on VT 9; second X on VT 10 works
* Switching to VT 10 brings the screen back to life
* Switching from VT 10 to other VTs != 9 works as intended
* Switching to VT 9 brings the broken screen back
* Switching from VT 9 does not cause any change in the screen,
unless the destination is VT 10
* Starting GL applications via VNC just hangs the application on a
broken session, whereas it works perfectly on a correct session.
I get the feeling that the card (driver) is confused by the combination
of GL and power save mode caused by an idle session and screensaver. The
GPU does not seem to hang, at
least /sys/kernel/debug/dri/{0,64}/i915_error_state contained no errors.
I have now switched to raw 2.12 and will try to reproduce the bug with
this version as well.
--
Julian Andres Klode - Debian Developer, Ubuntu Member
See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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