additional info that may be of interest:

on headphone insertion (2./4.) the "Speaker" "Mute"

- is automatically set to mute enabled, but
- has no effect (headphones are not muted either way)

and on headphone removal (3.) the "Speaker" "Mute" is enabled again

- another related bug just found: muting the "Speaker" (if headphone is 
removed) won't make it produce any sound again (even after alsa force-restart) 
(headphones still work on insertion)
  (somehow the master volume seems to be effected by this as well because it 
will jump to 0% and muted if one plays with the "Speaker" or "PCM" volumes in 
Gnome Alsamixer afterwards)

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https://bugs.launchpad.net/bugs/871611

Title:
  [TOSHIBA NB100, Realtek ALC262, Green Headphone Out, Rear] volume
  slider problem

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