Are you sure that all possible mixers are unmuted? There are at least two 
independent mixers that I know of:
1) 'alsamixer' on the command line
2) Gnome alsa mixer. Double click the speaker icon at the top right panel in 
gnome. Here you can display different channels by going into the preferences.

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No sound on HDA Intel;SigmaTel STAC9200; Gateway E100M 
https://bugs.launchpad.net/bugs/156580
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