[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 #1 from Direx <direx at betriebsdirektor.de> ---
I am on 4.8-rc4 now and it seems like the flickering could be related to these
messages:

[21494.389755] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[22199.026381] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=43427 end=43428) time 359 us, min 1192, max 1199, scanline
start 1179, end 1206
[22585.897409] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
[26998.328003] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun
[26998.999972] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun

There is still a very short random flickering about once per minute and a
longer flickering every 5-10 minutes. In the latter case I am getting a pipe
underrun in the kernel log.

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