[Bug 97805] Occasional GPU Hang: ecode 9:0:0x84dffff8, kernel: 4.7.3,

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97805

--- Comment #5 from Artem Shinkarov <artyom.shinkaroff at gmail.com> ---
A late update from my side.

I compiled a fresh kernel from the intel-drm repository (commit
9aa8c0cdbc076bcc0486d7a31922a0f77c032fe7) as I was suggested, and I am running
it for several weeks now.  

Most of the annoying behaviour went away.  However, there are few things that
are still there.  First of all, I occasionally see the following message in the
dmesg:

[  397.680131] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun

which causes a short blink of the screen.

Secondly, just today, a computer hang and the later inspection of system log
revealed stack traces caused by vblank wait time outs in functions
"intel_atomic_commit_tail" and "drm_wait_one_vblank".  Stack traces attached as
[2016-12-10-dmesg.txt].  I don't think I can extract more info, as I had to do
a hard reset.

Any suggestions?

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