Comment 91 for bug 946899

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.