Have you tried changing the default audio device from HDMI to analogue?
Yes, I have tried changing to audio device. This is while HDMI cable is still connected.
In each setting sound still comes through the receiver except for the pulseaudio setting.
Also turned pass through on and off and changed the number of channels
I have also turned on and off the low volume noise where still nothing comes through.
Not sure if any of those are associated.