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

[Jesse Barnes]

It's i915.i915_enable_rc6=0 for extra added redundancy.  You might also
try Daniel Blueman's IRQ fix.

Jesse

On Tue, 21 Jun 2011 07:57:13 +0200 (CEST)
"Nicolas Kalkhof" <nkalkhof at web.de> wrote:

> Hi Folks, ok, I'll give it a try this evening. Just one more thing: Should I pass enable_rc6 as a boot parameter like this: "i915.enable_rc6=0" or is it set by echoing sysfs (/sys/module/i915/parameters/...)? regards, nico
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: "Jesse Barnes" <jbarnes at virtuousgeek.org>
> Gesendet: Jun 21, 2011 2:19:29 AM
> An: "Ted Phelps" <phelps at gnusto.com>
> Betreff: Re: [Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches
> 
> >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
> 
> 
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-- 
Jesse Barnes, Intel Open Source Technology Center