All affected users I found in forums so far reported that they have
amdgpu in use.

I don't know if nouveau and radeon drivers have the same problem or not.
So as you already wrote in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834771/comments/20
the root problem seems to be that amdgpu (and maybe also other drivers)
doesn't set the eld_valid flag to 1, when a monitor is connected.

I have absolutely no idea how to handle this - where to file a bug for
such driver problems. But as long as we cannot assume that eld_valid is
correctly set, you better should not rely on it.

I would very much appreciate such a new patch.

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https://bugs.launchpad.net/bugs/1834771

Title:
  No HDMI-audio after kernel 4.15.-0.50

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