Yes, one workaround is*:
1) plug the headphone
2) open alsamixer
3) and unmute (press M) at the Speaker control.
* This have to be done every time after plugging the headphone.
Another workaround is**:
1) Open in text editor the file
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf
2) Comment the line as here:
[Jack_InputDevice]
#code = Headphone
3) Save the file
4) Restart pulseaudio with:
pulseaudio -k
** This have to be done just once.
Answering your questions:
> * if the "Speaker" volume is turned all the way down to -48 dB
(without muting it, just turning the volume all the way down), suddenly
your headphones mute.
No, Skeaker volume level at alsamixer does not affect headphone at all.
I was wrong when I said it before (about the -48 db), really sorry about
that. The headphone output is affected by mutting/unmutting the Speaker
control, but the volume level at this control does no affect headphone,
not even at -48 db. Tested it again right now.
> * if the "Speaker" is -47 dB your headphones are unmuted
Yes.
> * if the "Speaker" is 0 dB your headphones are unmuted
Yes.
* regardless of "Speaker" is -47 dB or 0 dB, headphones have the same
volume.
Yes. Headphone volume is affected by it's own volume control at
alsamixer, but not affected by the volume level at Speaker's control.
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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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