Investigating HDMI audio bug between 4.9.175 and 4.9.180

[Paul Dufresne]

A friend of mine asked me to look why his Linux Mint 20.3 installation was not outputing sound to his TV.

I discovered that in pavucontrol, the HDMI profiles were disabled because: unplugged (when really plugged).

Was able to aplay -D (hdmi device hw or "software") some.wav files (although often with 13494  [not real value but about that] channels found rather than 2,

depending on wav files].



Using Ubuntu kernels, I found the problem did not exist with kernels <= 4.9.175.

And exist with kernels >= 4.9.180.



So I thing what I would like to know is what Mainline kernels this corresponds to.



I think I must search more in radeon source code changes more than snd-hda-intel (not sure).



More details at:

https://forums.linuxmint.com/viewtopic.php?f=49&t=383607
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