upstream comment
IMO, the problem seen by the user is clearly an ALSA bug. Plugging in the
headphones should switch off the system speakers. That's what it does for most
of my hardware. Driver problem I'd say, because that behaviour is completely
busted:
"
Normally, when I plug in the headphones,
the front channel gets automatically muted. With the front channel muted, no
sound comes through the system speakers, but the volume level still controls
the audio volume of the headphones.
"
reassigning to alsa
** Changed in: alsa-lib (Ubuntu)
Sourcepackagename: gnome-control-center => alsa-lib
Assignee: Ubuntu Desktop Bugs (desktop-bugs) => (unassigned)
Status: Triaged => New
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Volume up keyboard hotkey unmutes channel, while volume down doesn't
https://bugs.launchpad.net/bugs/139887
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