[Bug 946899] Re: [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung

[Chas Emerick]

Another data point; I had posted over at
http://ubuntuforums.org/showthread.php?t=2168780, but recently found
this bug based on kernel crash syslog entries.

Anyway, I'm on a Macbook 4,2 FWIW:

$ uname -a
Linux cle-mba 3.8.0-29-generic #42-Ubuntu SMP Tue Aug 13 19:40:39 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

partial syslog:
Aug 22 05:26:55 cle-mba kernel: [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic root=UUID=748df707-f110-49e0-b603-7ca1439341d8 ro quiet splash resume=/dev/sda3 vt.handoff=7
Aug 22 13:17:49 cle-mba kernel: [78499.977886] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
Aug 22 13:17:49 cle-mba kernel: [78499.977892] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state

Attached i915_error_state from the same event.

Note that I used to have i915.i915_enable_rc6=0 in my grub options, but
removed it in an attempt to eliminate the hangs/crashes based on
recommendations on a random forum thread. :-P  Behaviour has been
unaffected; I get a GPU hang or window manager crash (i.e. have to
"recover" via tty1) ~every other day.

** Attachment added: "i915_error_state-20130822"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946899/+attachment/3784010/+files/i915_error_state-20130822

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https://bugs.launchpad.net/bugs/946899

Title:
  [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU
  hung

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