[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 #37 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Yu Kang Ku from comment #36)
> (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.

Can we repeat the failure with, say, only pipe B active + DDR DVFS disabled +
PM5 disabled + cxsr/maxfifo disabled + trickle feed enabled?

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