[Bug 104959] GPU HANG: ecode 9:-1:0x00000000, reason: Kicking stuck wait on bcs0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104959

--- Comment #2 from Imre Deak <imre.deak at intel.com> ---
(In reply to Chris Wilson from comment #1)
> DERRMR: 0x2077efef
> 
> That's not the right DERRMR, someone (fw? dmc probably) has been fiddling.

Yes, it saves/restores it's value across DC5/6 state transitions. It could be
the corruption issue:

(In reply to Thiago Macieira from comment #0)
> ...
> DMC: 1.26

so could you try version 1.27 where that's fixed?
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_dmc_ver1_27.bin

and

commit 39ccc9852e2b46964c9c44eba52db57413ba6d27
Author: Anusha Srivatsa <anusha.srivatsa at intel.com>
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:/

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