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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Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1718927
Title:
No hdmi sound after suspend/resume on 16.04
Status in pulseaudio package in Ubuntu:
Incomplete
Bug description:
When plugging in a HDMI TV to Lenovo Carbon 3rd Edition, sound works
perfectly, but when I suspend computer and resume it there is no sound
via HDMI in TV. However sound via built in speakers works fine. The
only thing I can do to restore sound is to reboot the machine. Similar
problem was discussed in following thread
https://ubuntuforums.org/showthread.php?t=2251651 with no solution. I
tested it on several versions of kernel 4.4.0 and on 4.4.8. Still no
solution.
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