Let me try to rephrase the audio problem.

The machine has three physical controls: volume up, volume down and
mute. It also has an LED indicating the mute status. Gnome and Vista
have a master volume slider and a mutton button on their GUIs. Normally,
any action on a physical control is reflected by the GUI control and
vice versa.

This machine seems to have a broken physical mute button, but that
shouldn't be a concern. It should still be possible to mute/un-mute by
clicking a mute button on the GUI. This works in Vista, but not in
Ubuntu.

Sound on the front speaker seems to depend on the status of the mute
LED. Since in Ubuntu this is always on, I hear nothing. Sound on the
headset is fine and can be controlled normally.

-- 
mute, brightness buttons on new HP 6930p laptop
https://bugs.launchpad.net/bugs/284319
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