Fresh install (20.04) on NUC10 but no HDMI audio, only 'dummy output'

Solution 1:

I have found a solution for my problem, posting here so it might help others save some time.

TL;DR

Upgraded kernel to 5.14+, as a fix has been applied for the NUC10.

Underlying problem

Found this Github issue in clearlinux related to the NUC10 and had a similar problem.
Noticed they have a similar alsa-info output.
They had a patch made and merged to alsa-devel and to the kernel 5.14.
The three OS's i tried had kernel version of 5.10 or 5.11. (ElementaryOs 6, LM 20.02 and Ubuntu 20.04)

And indeed - installing the new kernel solved my problem!
This might also be solved with installing that specific alsa package, but I have not tried that.