I tried to hibernate Ubuntu (which fails, but thats another issue) and resumed my system.
After this, the sound doesn't get played.
What command can/should I run to restart the ubuntu sound system.
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If Ubuntu is still using Alsa for its sound engine (I'm not sure as its been awhile since I've used it), you can restart by typing
sudo /etc/init.d/alsa-utils restart into the terminal.
Since it doesn't seem to be working, you might need to make sure that nothing is trying to use it. (example shamelessly stolen from the Ubuntu forums)
name@comp:~$ lsof | grep pcm sh 5079 name 70u CHR 116,6 13639 /dev/snd/pcmC0D0p name@comp:~$ kill -9 5079