[Bug 93842] Sandy Bridge, Kernel 4.4: [drm] stuck on render ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93842

--- Comment #9 from Matt Turner <mattst88 at gmail.com> ---
(In reply to Matt Turner from comment #8)
> If that bisect is correct (I have some doubts), setting
> INTEL_DEBUG=nocompact should avoid the issue. If it does, then we should be
> able to debug it quite easily from there.

Hm. I see I only added that environment variable in time for 11.1.

Try putting an unconditional return at the top of the
brw_compact_instructions() function in
src/mesa/drivers/dri/i965/brw_eu_compact.c. That will have the same effect
(disabling instruction compaction) as the environment variable would have.

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