My front audio output would not work even though the front mic input did fine.
The Pulse Audio mixer (= Ubuntu default) does not offer any complex controls to fix the issue. Instead, run gamix
(be prepared for a GUI blast) and switch "Independent HP" to OFF. The label may be different for your audio device.
This enables all available audio outputs.
Posted by Arne Hartherz to makandra dev (2011-06-08 13:40)