[Bug 43267] [SNB rc6] GPU hangs with i915_enable_rc6=1

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=43267





--- Comment #71 from jrierab <jrierab at gmail.com>  2013-04-19 18:40:11 ---
Rodrigo, I'm still doing my homework with that branch ;-)

I need to test on my home system, and I have not much time lately...

However, today I've been testing the base branch, just to be absolutely sure
that the bug is still present there, and it has crashed after an accumulated
5:30h (1:15h today). It failed with:

"[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
 [drm] capturing error event; look for more information
in/sys/kernel/debug/dri/0/i915_error_state".

Desktop freezes completely for more than 20 seconds. I was able to switch to
console and get a report. Then, switched back to graphics and eventually
recovered, but with small freezes and lags in desktop for several seconds. Lots
of crash errors followed on dmesg after the first one.

Summarizing the tests:

* "Original" 3.9.0.rc5 with partial patch accumulated 15:30h without error.

* Head branch (no patch) failed after 5:30h. Single error followed by multiple
crashes.

* Head with TurboDisable patch failed after 1:42h uptime with a single error,
but I didn't wait to see if crashes appeared in dmesg after a while.

* Head with FixfreqTable failed after 00:12h uptime. Several errors and
crashes.

* Now testing head with FixRPControl. No error for about 6h uptime.

So, maybe FixRPControl does the trick. 

Or maybe I am simply lucky to avoid hitting the bug by now, but it will appear
eventually. I will try to accumulate enough running time to be as sure as
possible about it.

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