[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #42 from Norman Yarvin <yarvin at yarchive.net> ---
I'm seeing this bug, or something like it, on an older chip (G965, desktop
version):

Feb 19 22:05:56 muttonhead kernel: [drm:i915_hangcheck_hung] *ERROR* Hangcheck
timer elapsed... GPU hung
Feb 19 22:05:56 muttonhead kernel: [drm] capturing error event; look for more
information in /debug/dri/0/i915_error_state
Feb 19 22:05:56 muttonhead kernel: [drm:kick_ring] *ERROR* Kicking stuck wait
on render ring
Feb 19 22:05:57 muttonhead kernel: [drm:i915_reset] *ERROR* Failed to reset
chip.

after which the mouse pointer sticks in one spot (with most other things
working), and then when I shut down X, the console fails to appear, requiring a
reboot.  Not knowing that the given file path was under /sys/kernel, I failed
to capture the error state, but will do so next time this happens (which is
maybe every other day).  This is with a 3.7 kernel (Gentoo); before 3.7, the
driver was stable.  I don't know what the 'generation' numbers in the driver
mean, but I'm guessing that generation 6 is later, so many of the suggested
fixes would not make any difference on this machine.

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