[Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches

[Ted Phelps]

Hi Nicolas,

Nicolas Kalkhof writes:
> SNB GPU still hangs frequently with kernel patches next-20110620
> raising "drm:i915_hangcheck_ring_idle *ERROR* Hangcheck timer
> elapsed... gen6 bsd ring idle". This happens when multiple
> applications (mplayer decoding vaapi stream and some openGL game)
> running at the same time. With either one running there is no
> stalling. Could someone please confirm the issue?
>
> /sys/module/i915/parameters/semaphores is set to 0
> xf86-video-intel compiled with --enable-sna

I haven't tried SNA, but I've seen GPU hangs as well (SNB 2600K).  I've
found that disabling RC6 (enable_rc6=0) seems to help.  Can you see if
that helps?

[Note to self: submit a bug report]

Thanks,
-Ted