[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 #31 from Direx <direx at betriebsdirektor.de> ---
(In reply to yann from comment #17)
> Please re-test with Paulo's patch to apply memory workarounds for skylake:
> https://patchwork.freedesktop.org/series/13548/

I've been testing the rebased patch on 4.8.1 now for a while. I cannot confirm
significant positive effects, however I haven't experienced any negative
effects at all. The flickering might have become a little better, it's hard to
tell. There are only very few screen flickers (once every ~30 minutes), so the
machine is definitely usable. There still are the usual underruns:

[15792.820143] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
[16070.293825] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[18877.276327] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe A (start=224491 end=224492) time 471 us, min 1192, max 1199, scanline
start 1189, end 1227
[22438.333764] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[22692.923450] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun

Also, suspend/resume cycles work fine.

I can also confirm that drm-intel-nightly feels quite good. Maybe there finally
is hope for Skylake users (more than one year after the platform's release).

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