make headphone controls more intuitive

[geofft]

It's generally the case that on clusters, you need to open the full gnome-volume-control (or alsamixer) and figure out which channel is the built-in speaker and mute it, in addition to unmuting and bringing up the volume on the headphones. This is pretty undiscoverable, especially if your headphones are in and you don't notice that the built-in speaker is also making noise.

Is there a way around this? For instance, we could unmute headphones by default (and unmute PCM, and simply mute Master or Master Mono when reactivating).

[broder]

Is this ticket equivalent to #425 (switch to pacmd for muting sound on cluster machines)?

[jdreed]

I agree that this is related to (or will be fixed by) #425.