This reliably happens to me when dragging a firefox window from one
monitor to another in 13.04. As above, unity --replace fails and I have
to reboot the computer to make it work again. It seems to have started
just a week or two ago.
Hardware/software info:
Dell Latitude E6410
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02)
ii libgl1-mesa-dri:amd64 9.1.7-1ubuntu2
amd64 free implementation of the OpenGL API -- DRI modules
ii xserver-xorg-video-intel 2:2.21.6-0ubuntu4.3
amd64 X.Org X server -- Intel i8xx, i9xx display driver
In dmesg, I see:
[ 280.763186] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[ 280.763195] [drm] capturing error event; look for more information in
/debug/dri/0/i915_error_state
[ 282.750114] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[ 282.750272] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
[ 282.750275] [drm:i915_reset] *ERROR* Failed to reset chip.
I'm not sure how to see /debug/dri/0/i915_error_state - is there a
/debug filesystem I can mount or something?
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https://bugs.launchpad.net/bugs/932900
Title:
Unity freeze, crashes when trying to restart - GPU lockup with IPEHR:
0x7a000002
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