Public bug reported:

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.

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1718927

Title:
  No hdmi sound after suspend/resume on 16.04

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