https://bugs.freedesktop.org/show_bug.cgi?id=105654
--- Comment #7 from Tanu Kaskinen <[email protected]> ---
It sounds like your headphones are muted - check if that's the case. If they
don't seem to be muted, then attach the output of "amixer -c0" when you have
selected the headphone port. Hmm, did you apply the workaround in
analog-output-headphones.conf? Maybe the Front element actually does affect the
headphone output, in which case it must not be set to off in
analog-output-headphones.conf. I said previously that it doesn't affect the
headphone output on your machine, but I actually don't have any evidence for
that statement.
The lineout port is behaving as expected. If auto-mute is enabled in alsa, then
lineout will be muted always when you have headphones plugged in. Auto-mute
must be disabled if you wish to use lineout while having headphones plugged in.
It seems I blamed the kernel too soon. In my experience, usually "Front" is the
only element that controls whether audio goes to lineout, which is why I jumped
to the conclusion that the ambiguity of the Front element semantics is to
blame, but it seems that you have a "Line" playback switch, which can probably
be used to mute the speakers without muting the headphones. PulseAudio
currently ignores that element, so try adding this to
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-lineout.conf:
[Element Line]
switch = mute
volume = merge
...and this to
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf:
[Element Line]
switch = off
volume = off
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