I had a similar problem. There was a partial workaround to get sound working again here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/288861
where alsamixer -Dhw revealed that the PCM volume was at zero, and turning it up restored sound operation. I still have the problem that my system hangs during shutdown while it is shutting down ALSA.
Here is a list of similar bugs:
#288861 #288652 #288093 #288039 #286966 #286430 #285965
I had a similar problem. There was a partial workaround to get sound working again here:
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/288861
where alsamixer -Dhw revealed that the PCM volume was at zero, and turning it up restored
sound operation. I still have the problem that my system hangs during shutdown while it is
shutting down ALSA.
Here is a list of similar bugs:
#288861
#288652
#288093
#288039
#286966
#286430
#285965