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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=54226#c226">Comment # 226</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=54226">bug 54226</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to Martin Steigerwald from <a href="show_bug.cgi?id=54226#c225">comment #225</a>)
<span class="quote">> Chris, you referred me to this bug as I reported
>
> <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - [4.1-rc6] gpu hang: ecode 6:-1:0x00000000, Kicking stuck semaphore on render ring"
href="show_bug.cgi?id=90835">Bug 90835</a> - [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?</span >
There's likely a modest improvement in 4.2.
<span class="quote">> 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</span >
Fortuitously that dangerous option doesn't do anything for your kernel.
<span class="quote">> 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.</span >
Purely circumstantial.
<span class="quote">> 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?</span >
Yes.</pre>
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