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

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





--- Comment #66 from jrierab <jrierab at gmail.com>  2013-04-06 14:36:01 ---
Ok. Let's summarize my tests. All of them are performed with the HEAD
07961ac7c0ee8b546658717034fe692fd12eefa9 kernel branch 'master' of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux, UXA accelaration
activated and same intel drivers from xorg-edgers ppa (git 20130328).

1. HEAD kernel (no patch, no revert). No sign of bug for 3h. But just when I
was about to power off, it hung for about 1 minute. Then recovered.

2. HEAD with revert commit as suggested. After 30m uptime, lots of errors in
dmesg ("*ERROR* Timed out waiting for forcewake to ack request."). After a
little while, a completely system hung, with no recovery.

3. HEAD with Rodrigo's patch partially applied. Accumulates more than 11h
uptime without any sign of the bug.

I captured reports of 1 and 2 (just before complete system hung). They are
probably very similar at the ones already attached, but feel free to ask for
them if you feel they will give some useful info.

I am using 3 as my default boot kernel for now on. Since there is no easy way
to exactly trigger the bug, only with enough accumulated uptime can we assume
that the bug is really gone. 

However, a look at the diff file from 1 to 3, which is attached in #64
(https://bugzilla.kernel.org/show_bug.cgi?id=43267#c64) should be considered.
It really seems that the patch does something good.

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