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0e1f616
(Get the code!)
Hi all!
Just for reference, - I can confirm this annoying issue also for Kernel 5.11.0-38-generic (Kubuntu 20.04 LTS). The used Radeon hardware is quite old, the sound is listed as "RV635 HDMI Audio [Radeon HD 3650/3730/3750]".
In my case the audio started to work after I installed "pavucontrol" and then I just selected the (inactive) Radeon HDMI profil under "Configuration". That was all.
The crazy thing is that the HDMI is still shown as "unplugged" but it works. And I really didn't have applied any of the above mentioned patches, - weird. ;-)