Investigating HDMI audio bug between 4.9.175 and 4.9.180

[Khaled Elmously]

On 2022-10-14 07:05:16 , Paul Dufresne wrote:
> 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.
> 
> 

What Ubuntu release are you using? There are no Ubuntu-releases that are currently supported that use a 4.9 kernel.
In fact, I don't think Ubuntu ever released a 4.9 kernel. See https://askubuntu.com/questions/517136/list-of-ubuntu-versions-with-corresponding-linux-kernel-version

Current officially supported Ubuntu kernels are versions 4.15 (18.04 "bionic"), 5.4 (20.04 "focal"), 5.15 (22.04 "jammy").



> 
> 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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