@Alexey - indeed I can reproduce both the headphone noise plus the weird
muting of LFE and Surround - this sounds like a bug in pulseaudio (since
it is muting them in the first place and then not muting them) so I'd
file a separate bug about that.

Will have a look at trying to trackdown the static / noise in
headphones...

Also LFE is the standard name for subwoofer in ALSA and will likely
break lots of things if changed - ie. this is represented by the simple
fact that before my patch, the headphones were labelled 'HP' which
pulseaudio didnt understand, but simply renaming it to 'Headphone' in my
patch makes them controlled with the master volume - so names matter and
in this case LFE should definitely not be changed as its basically a
standard.

-- 
Poor support for MacBook Pro 5,1: noise, no jack sense, no in-line headset 
microphones, broken volume control
https://bugs.launchpad.net/bugs/488103
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