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This problem is inherited from Ubuntu 12.04, it wasn't present in 11.10
and seems to be fixed in the beta for 12.10, though I can't find any
triaged versions of the bug to explain the fix.
It appears to be an issue with ALSA and Realtek sound cards where ALSA
doesn't automute the speakers when something is plugged into the
headphone jack, instead sound comes out of both. If the headphones are
plugged in and then the computer is suspended, coming out of the
suspension will make the speakers mute and sound only come out of the
headphones, though once you remove the headphones, sound does not resume
coming out of the speakers. So it's either a failure to detect the
change or a failure to do anything about the change.
If this problem is in ALSA, it might be wise to backport the version of
ALSA from 12.10 into Luna, or users, myself included, will have to
suffer from this.
** Affects: elementaryos
Importance: Undecided
Status: Won't Fix
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: Incomplete
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Speakers don't automute when headphones plugged in
https://bugs.launchpad.net/bugs/1047600
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