[Bug 97450] [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97450

--- Comment #18 from Direx <direx at betriebsdirektor.de> ---
(In reply to Paulo Zanoni from comment #10)
> Hello
> 
> Can you please confirm whether
> https://patchwork.freedesktop.org/patch/113642/ fixes the problem?
> 
> Thanks,
> Paulo

I've been testing this for a few days now (4.8.1 with your patch) and I have
not seen the bad flickering ever since. At least my Skylake machine is usable
again.

But the flickering issue has not been resolved completely. Every ~10-15 minutes
I am getting one of these messages in my system log, accompanied by a very
short display flicker (on one of my screens):

[19523.129445] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe C (start=132656 end=132657) time 383 us, min 1043, max 1049, scanline
start 1040, end 1065
[20898.089311] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun

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