[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #30 from phil.smith at adder.com ---
> Is only second monitor going blank or both the monitors are going blank?

>From one of our developers:
My i3 board had a single underrun error on both pipe A and pipe B over the
weekend. I had rebooted it on Thursday after removing the command line settings
for i915.enable_psr and i915.enable_fbc.  There was another burst of pipe A
errors when I turned on one of the monitors this morning. Both displayport
outputs have stopped working.
[200443.554941] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[200443.555026] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
B FIFO underrun
 : : :
[319240.880577] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[319262.015158] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[319281.949569] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[319301.884045] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[319321.835242] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[319341.769694] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun

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