I've tried the solution from 11.04 however it doesn't seems to work. No matter what do I mute or unmute.
1 Answer
I solved it one minute ago, try:
sudo add-apt-repository ppa:ubuntu-audio-dev/alsa-daily
sudo apt-get update
sudo apt-get install alsa-hda-dkms
then reboot or
sudo alsa force-reload
sorry if too late