[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 #63 from Chris Wilson <chris at chris-wilson.co.uk> ---
As a workaround, this

commit a24a11e6b4e96bca817f854e0ffcce75d3eddd13
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Mar 14 17:52:05 2013 +0200

    drm/i915: Resurrect ring kicking for semaphores, selectively

should improve the recovery from the hangs.

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