Comment 513 for bug 1140716

(In reply to Martin Steigerwald from comment #225)
> 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?

There's likely a modest improvement in 4.2.

> Also I note that I still use
>
> Option "AccelMethod" "uxa"
>
> and I have
>
> martin@merkaba:~> cat /etc/modprobe.d/i915-kms.conf
> options i915 modeset=1 i915_enable_rc6=7

Fortuitously that dangerous option doesn't do anything for your kernel.

> ffffffff813a4b0e
> 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.

Purely circumstantial.

> 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?

Yes.