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[WHL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B FIFO underrun

Submitted by Sushma

Assigned to Intel GFX Bugs mailing list

Link to original bug (#111726)

Description

Created attachment 145408
dmesg for FIFO underruns in PIPE B

The issue is reproducible on Chrome OS WHL device when we connect a 4K external monitor to DUT. I was able to reproduce quite often using LG model 27UD88-W.

Attaching the log where I could reproduce the issue even on drm-tip.

Attachment 145408, "dmesg for FIFO underruns in PIPE B":
drm_tip_fifo_messages

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