alsamixer -c0
Selecting the master channel and pressing "m" to mute it and then unmute
it has the same effect. It's an ALSA driver bug in snd-hda-intel.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Muting and unmuting Master channel when headphones are plugged in causes
internal speaker to unmute on MacBook Pro
https://bugs.launchpad.net/bugs/212051
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