[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 #36 from Yu Kang Ku <ykku16dev2 at gmail.com> ---
(In reply to Ville Syrjala from comment #33)
> So what might be interesting is checking if we can reproduce the issue when
> driving HDMI out of port B with pipe A or B. Thus far you've just driven
> HDMI with port D/pipe C, no?

That's correct.  So far, we've been using port D/pipe C exclusively.

> Assuming a standard RVP setup you would just need any old DP++ DP->HDMI
> dongle/cable and hook it up to the DP port instead of using the HDMI port on
> board.

I ran the new experiment exactly as you described, using a DP->HDMI cable. 
Unfortunately, the problem is still reproducible.  The output of
intel_watermark is here: https://bugs.freedesktop.org/attachment.cgi?id=127557.
 The output of "intel_reg dump --all" is here:
https://bugs.freedesktop.org/attachment.cgi?id=127558.

These captured outputs will show that the new experiment is using port B/pipe
B.

Just for the record, the experiment was done on a BSW RVP using
drm-intel-nightly without any of the changes that you've previously
recommended.

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