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<body><span class="vcard"><a class="email" href="mailto:imre.deak@gmail.com" title="Imre Deak <imre.deak@gmail.com>"> <span class="fn">Imre Deak</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW bisected]igt/pm_pc8 subcases cause system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77565">bug 77565</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>ASSIGNED
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW bisected]igt/pm_pc8 subcases cause system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77565#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW bisected]igt/pm_pc8 subcases cause system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77565">bug 77565</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@gmail.com" title="Imre Deak <imre.deak@gmail.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=77565#c4">comment #4</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=77565#c3">comment #3</a>)
> > I think Imre has a patch to prevent runtime pm until the delayed rps work
> > has completed. That should address this.
>
> I haven't checked yet this bug closer, but note that RC6/RPS is not enabled
> on BDW on current -nightly, I'm not sure if it's by overlook or on purpose.
> At least intel_disable_gt_powersave() is broken on BDW, since it'll try to
> disable RC6/RPS when it wasn't enabled in the first place. I posted a fix
> for this issue:
>
> <a href="http://lists.freedesktop.org/archives/intel-gfx/2014-April/043695.html">http://lists.freedesktop.org/archives/intel-gfx/2014-April/043695.html</a>
>
> As Daniel mentioned, in the same patchset there is also a patch to disable
> RPM until RC6/RPS is setup, but I'm not sure how that can make a difference
> on BDW, since we never enabled RC6/RPS there.</span >
So I think the likely reason for the failure is that we don't enable RC6 but we
enable RPM (which depends on RC6). I suggest we fix this for now by correctly
reporting that RC6 is disabled and also keep RPM disabled based on this.
I cherry-picked the necessary patches from my VLV RPM branch for this and added
a new one that reports the correct RC6 status for BDW. It's an obvious fix as
it only keeps RPM disabled on BDW, but I still suggest it until BDW RC6 support
is fixed.
Daniel, if it's ok I can submit these patches separately from the rest of VLV
RPM stuff.
Please try the following branch:
<a href="https://github.com/ideak/linux/commits/bdw-rc6-rpm-fix">https://github.com/ideak/linux/commits/bdw-rc6-rpm-fix</a></pre>
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