[Bug 90307] [IVB] at boot all displays cycled on/off over and over *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90307

--- Comment #2 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
The problem is that these bugs are rare and difficult to reproduce. I just had
a similar/same error that turned off only one display, but it occurred after 22
days of uptime:

[1889327.745544] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[1889327.745556] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
FIFO underrun
[1889327.745583] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder B
[1889327.745585] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH
transcoder B FIFO underrun

It could be recovered by `xrandr --off` then `xrandr --auto`. Maybe the log
gives some hints, but a bug that only appears once in 22 days would take a long
time to track down...

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