This was affecting me, but I found a workaround on another forum or bug somewhere:
Steps:
* Run alsamixer
* look for muted outputs
* unmute
for me it was "S/PDIF 1".
All the behaviour above matches - worked on previous ubuntu installs on the same hardware, other sound outputs worked - just not HDMI.
Still needs a bugfix I guess - so that it isn't unnecessarily muted, or at least so that it can be unmuted through the normal GUI. But a good workaround so far.
This was affecting me, but I found a workaround on another forum or bug somewhere:
Steps:
* Run alsamixer
* look for muted outputs
* unmute
for me it was "S/PDIF 1".
All the behaviour above matches - worked on previous ubuntu installs on the same hardware, other sound outputs worked - just not HDMI.
Still needs a bugfix I guess - so that it isn't unnecessarily muted, or at least so that it can be unmuted through the normal GUI. But a good workaround so far.