look this Image.

http://img839.imageshack.us/img839/7145/bildschirmfotovom201205.png

In Profile I can choose "No Audio" After that, I choose audio stereo
again and sound is back again.

hope it works .. ;)

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https://bugs.launchpad.net/bugs/941219

Title:
  [Acer Aspire 8930G] Speaker Sound does not mute when Headphones are
  connected. Ubuntu 12.04 LTS. Missing Auto-Mute Mode in alsamixer.

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