Actually a slightly better workaround would be to open
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf
And change:
[Element Speaker]
switch = off
to
[Element Speaker]
switch = mute
...that way the port will switch, which means you can have different
volumes for speaker and headphones, but "Speaker playback switch" will
not mute when "headphones" is selected.
I have analyzed your issue a bit, but I'm unsure whether this is
actually a bug in the codec hardware, or if it's related to the GPIOs.
Marking as triaged for now.
** Package changed: pulseaudio (Ubuntu) => alsa-driver (Ubuntu)
** Changed in: alsa-driver (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/921397
Title:
Speaker audio channel goes mute after plugging in the headphone
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