Please try the following commands (please copy and paste verbatim into a Terminal):
kill $(lsof -t /dev/dsp* /dev/snd/*) ; sudo modprobe -r $(lsmod |grep
^snd |awk '{print $1}') && sudo modprobe snd-cs4231
** Changed in: alsa-driver (Ubuntu)
Importance: Undecided => Low
Status: Confirmed => Needs Info
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Neomagic Corporation NM2200 - no sound
https://launchpad.net/bugs/82765
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