[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

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |NEEDINFO

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Hmm. So it seems to die while in steady state, or at least no plane changes
visible in the logs around the underruns. Hard to be 100% sure though as I'm
not sure we log every plane change, and also underruns don't actually generate
an interrupt, so we might detect them after the fact.

If we assume that no planes really change when the underrun happens, then I
guess we're just too late in fetching the data. It's a little troubling that we
are hitting that even with PM2 watermarks, so PM5/DDR DVFS (which are the usual
latency causing suspects) aren't supposedly even enabled.

Can you grab the output of intel_watermark from intel-gpu-tools, just after
hitting the underrun? I want to double check that are in fact programming the
watermarks correctly.

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