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

[Jesse Barnes]

On Tue, 21 Jun 2011 10:01:35 +1000
Ted Phelps <phelps at gnusto.com> wrote:

> 
> 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]

Please do; and please try to confirm that your GPU hangs are really rc6
related.  RC6 provides a huge (multiple Watt) power savings, and we
really want it to be robust.

-- 
Jesse Barnes, Intel Open Source Technology Center