[Bug 76564] [AMD Fusion E-350] HDMI refresh rates doesn't match expectations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76564

--- Comment #7 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #6)
> (In reply to comment #5)
> > Probably a duplicate of bug 71753.
> 
> Yes I read that report. What I don't understand is how the audio clock, uvd
> clock, hdmi clock, etc relate to each other.
> 
> For audio I use the realtek chip and it's SPDIF. I guess with the audio
> clock, the HDMI audio clock is used? Which in my case is not used I guess.

They are not really related on the hw side.  UVD decodes as fast as it can
based on it's own clocks.  When the decoded frame is displayed is up to the
application.  The audio chip has it's own clock and the display has it's own
clock.  The hdmi audio information is embedded in the display stream.  The
monitor uses special packets that the GPU embeds in the display stream to
reconstruct the audio stream on the monitor based on the display clock.  There
seem to be cases where the hdmi stream is not set up properly so the audio
clock is not recovered properly on the monitor side.

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