[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #225 from Martin Steigerwald <Martin at Lichtvoll.de> ---
Chris, you referred me to this bug as I reported

Bug 90835 - [4.1-rc6] gpu hang: ecode 6:-1:0x00000000, Kicking stuck semaphore
on render ring

I skimmed through it and it appears that there are some patches to test? But I
am not sure which ones these are. Can you or someone else enlighten me?

Also I note that I still use

        Option          "AccelMethod"   "uxa"

and I have

martin at merkaba:~> cat /etc/modprobe.d/i915-kms.conf 
options i915 modeset=1 i915_enable_rc6=7

thus maximum energy saving. But according to powertop it never enters the
highest sleep state anyway.

I will remove the AccelMethod setting now and see whether it helps. If not, I
downgrade to 4.1-rc4 for now, as issues have been at least much less frequent
with it.

And its really that for me 4.1-rc6 makes things much *worse*. I am typing this
after a clean reboot and already got the GPU hang again. It happens about every
few minutes. Are you really sure this is the same GPU hang? I didn´t have this
before 4.1 kernel?

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