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I've tried the solution from 11.04 however it doesn't seems to work. No matter what do I mute or unmute.

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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

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protected by Community Feb 13 '12 at 16:41

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