[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 #11 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 126993
  --> https://bugs.freedesktop.org/attachment.cgi?id=126993&action=edit
[PATCH] drm/i915: Set DDL to 0

I guess we could try to tighten the display engine's deadlines a bit. This
should force the deadline to be 0 always, so in theory the system agent
shouldn't be allowed to delay things at all.

If that doesn't help, you could also try to play around with the memory latency
values. Based on your logs I think you'd have to go up to 15 usec to make any
change to the watermarks. So something like this:
echo '15 0 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
and then force a modeset on all pipes (eg. xset dpms force off; xset dpms force
on).

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