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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#c227">Comment # 227</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:Martin@Lichtvoll.de" title="Martin Steigerwald <Martin@Lichtvoll.de>"> <span class="fn">Martin Steigerwald</span></a>
</span></b>
<pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=54226#c226">comment #226</a>)
<span class="quote">> (In reply to Martin Steigerwald from <a href="show_bug.cgi?id=54226#c225">comment #225</a>)
> > 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?
>
> There's likely a modest improvement in 4.2.</span >
Nice.
<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
>
> Fortuitously that dangerous option doesn't do anything for your kernel.</span >
Well I found out why, I compiled i915 into the kernel it seems, at least I
don´t have an i915 module in lsmod. But also i915.i915_enable_rc6=7 on kernel
command line does not seem to have any effect. I removed the option.
<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.
>
> Purely circumstantial.</span >
Since using SNA I didn´t see a GPU hang so far. Too early to say for sure, but
it seems something in UXA may have triggered it more easily.</pre>
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