Are you using your laptop with the lid closed, or is there just no sound
after you reopen it?
Also, please try running this command before and after the problem
occurs:
$ ps ux | grep pulseaudio
I suspect the issue might be that the pulseaudio process is vanishing.
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1707027
Title:
Sound device no longer detected after closing laptop lid
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