[Bug 111726] [WHL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111726

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |CFL
             Status|NEW                         |NEEDINFO
         Whiteboard|                            |Triaged
      i915 features|                            |display/watermark

--- Comment #1 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Sushma from comment #0)
> Created attachment 145408 [details]
> 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.

Sushma, What is the impact of this issue other than the errors in the log?
What is the reproduction rate?

Can you please attach the dmesg from drmtip, that will be helpful to
investigate.

Update for myself: On our CI system last seen FIFO underrun on WHL is
drmtip_334 (1 month, 3 weeks old).

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