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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - GPU HANG: ecode 9:-1:0x00000000, reason: Kicking stuck wait on bcs0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104959#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - GPU HANG: ecode 9:-1:0x00000000, reason: Kicking stuck wait on bcs0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104959">bug 104959</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=104959#c1">comment #1</a>)
<span class="quote">> DERRMR: 0x2077efef
>
> That's not the right DERRMR, someone (fw? dmc probably) has been fiddling.</span >
Yes, it saves/restores it's value across DC5/6 state transitions. It could be
the corruption issue:
(In reply to Thiago Macieira from <a href="show_bug.cgi?id=104959#c0">comment #0</a>)
<span class="quote">> ...
> DMC: 1.26</span >
so could you try version 1.27 where that's fixed?
<a href="https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_dmc_ver1_27.bin">https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_dmc_ver1_27.bin</a>
and
commit 39ccc9852e2b46964c9c44eba52db57413ba6d27
Author: Anusha Srivatsa <<a href="mailto:anusha.srivatsa@intel.com">anusha.srivatsa@intel.com</a>>
Date: Thu Nov 9 17:18:32 2017 -0800
drm/i915/skl: DMC firmware for skylake v1.27
Yes, we need to start backporting these:/</pre>
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