[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 #11 from rockorequin at hotmail.com ---
@Paulo: I have been running 4.8.0 from git patched with
https://patchwork.freedesktop.org/patch/113642/ for some hours now and so far I
haven't seen this issue occur at all. (Thanks for the patch.)

In case it's of interest, there are some atomic update failure messages and one
buffer under-run in dmesg:

[   86.182013] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=3475 end=3476) time 103 us, min 1073, max 1079, scanline start
1072, end 1079
[ 7689.788816] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=124404 end=124405) time 105 us, min 1073, max 1079, scanline
start 1072, end 1080
[10148.377778] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=55108 end=55109) time 139 us, min 1073, max 1079, scanline
start 1071, end 1081
[10183.928593] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe A (start=57241 end=57242) time 107 us, min 2146, max 2159, scanline
start 2145, end 2160
[10450.277698] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=73222 end=73223) time 143 us, min 1073, max 1079, scanline
start 1070, end 1080
[12488.118382] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe B (start=3667 end=3668) time 103 us, min 1073, max 1079, scanline start
1072, end 1080
[14088.803554] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe A (start=4992 end=4993) time 393 us, min 2146, max 2159, scanline start
2127, end 2180
[15013.089253] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe A (start=60446 end=60447) time 102 us, min 2146, max 2159, scanline
start 2145, end 2159
[15755.731898] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun

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