So typically on most laptops, when the headphone plug is inserted into
the headphone jack, sound to the internal speakers is cut off and plays
through only the headphones. (This is the behavior in OS X, for example,
and I believe it was also the 8.10 behavior.) I thought this was
implemented in hardware, but apparently it's implemented by the sound
driver, as Kacper's patch demonstrates. I think someone else already
requested this above, but would it be possible to have a patch that
mutes the internal speakers when headphones are inserted?

Also, and I believe this was also mentioned above, could we have a patch
where Master controls the volume of the headphone output, too? Of
course, this would only be useful if the above muting of speakers was
implemented, as well.

Kacper, are you the only developer working on this? Is anyone else
involved with the ALSA project looking into this?

-- 
Left speaker doesn't work, controls mixed up on Apple MacBook[Pro] (5,1)
https://bugs.launchpad.net/bugs/337314
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