Hi, thanks for the replies.  It has happened twice to me now.

First time, I spent a long time trying to fix it, but fixed it by
reinstalling ALSA at last.

This time, I tried that but it didn't work.  It just randomly started
working 5 minutes ago!

The cause of the bug was that I pressed the mute hotkey on my computer.
I then turned mute off again, but the sound stayed off.

Sorry to bother you.

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[Conexant CX20561 (Hermosa)] pactl stat failed to find default card
https://bugs.launchpad.net/bugs/617388
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