At a guess, your system is probably reverting back to the default audio
device on resume.
What does it look like in Settings after resuming? Can you change the
audio playback device back to HDMI by hand?
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1718927
Title:
No hdmi sound after suspend/resume on 16.04
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