I have an Intel NUC (NUC7i3BNH, i.e., using Intel High Definition Audio) running Ubuntu 16.04.3. Its intended use is for a media center. I'm unable to get HDMI audio working unless I allow the system to sit idle (5 minutes by default) long enough for the display to sleep. When the display is woken back up, HDMI audio works perfectly.
Pavucontrol has no effect on the issue. Full system suspend does not fix HDMI audio. I've tried multiple displays, same behavior with each.
Any ideas? Thanks!