[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 #15 from Ted <yingted+freedesktop at gmail.com> ---
I also started experiencing this issue. I've seen most of the issues mentioned,
plus the computer would sometimes freeze (screen is black and caps lock light
does not toggle).
After applying the patch, I haven't had any problems yet (freezing, black
screen, flickering).

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
$ dmesg -l err -w
[ 3221.487848] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure
on pipe A (start=87034 end=87035) time 301 us, min 763, max 767, scanline start
753, end 768
[ 4236.060368] tpm tpm0: A TPM error (325) occurred stopping the TPM
[ 4236.322922] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[ 9858.626083] tpm tpm0: A TPM error (325) occurred stopping the TPM
[ 9858.915548] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[ 9875.987934] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[10794.506952] tpm tpm0: A TPM error (325) occurred stopping the TPM
[10794.779128] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[10826.831623] tpm tpm0: A TPM error (325) occurred stopping the TPM
[10827.114490] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[10862.320313] tpm tpm0: A TPM error (325) occurred stopping the TPM
[10867.941723] snd_hda_intel 0000:00:1f.3: azx_get_response timeout, switching
to single_cmd mode: last cmd=0x206f0900
[10867.980104] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register
0x2f0d00. -5
[10868.176508] snd_hda_codec_realtek hdaudioC0D0: out of range cmd
0:20:400:ffffffff
[10868.195635] snd_hda_codec_realtek hdaudioC0D0: Unable to sync register
0x2b8000. -5
[10868.195769] snd_hda_codec_realtek hdaudioC0D0: Unable to sync register
0x2b8000. -5
[10869.673593] snd_hda_codec_realtek hdaudioC0D0: out of range cmd
0:20:400:ffffffff
[10909.607243] tpm tpm0: A TPM error (325) occurred stopping the TPM
[10909.892588] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[10943.200346] tpm tpm0: A TPM error (325) occurred stopping the TPM
[10943.475999] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[10958.114510] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[10982.525656] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[11002.254512] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[11025.533533] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[11054.397515] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[11071.691503] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[11346.956583] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun

The pipe underruns happen generally when I plug/unplug a monitor and/or move a
mouse across monitor boundaries.

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