[Bug 97965] [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97965

--- Comment #24 from Yu Kang Ku <ykku16dev2 at gmail.com> ---
For the pipe B experiment, I'm running into some hurdles that will take some
more time to fix.

Meanwhile, I did the following experiment which might indicate that the problem
is isolated to pipe C.  I closed the lid so that the primary display would go
away while the external HDMI display would continue with the video playback. 
This is basically dock mode.  Yet, the problem is still reproducible.  The
output of intel_watermark is here:
https://bugs.freedesktop.org/attachment.cgi?id=127107

This experiment was done using drm-intel-nightly with all of the suggestions
you have recommended so far (DDL=0, latency=45us, and cursor WM=63).  However,
the experiment was done on a production device on which dock mode was
functional.  I was not able to "close the lid" on the BSW RVP.  I found the
switch on the BSW RVP for "closing the lid", but dock mode wasn't working for
some reason.

What do you think of this dock-mode experiment?  Do you think it's still
worthwhile to continue with the pipe-B experiment?

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