08.02.2015 11:06, Raymond Yau wrote:
> >
> >> Hrm, that is actually a good question. In theory, I would expect
> >> module-switch-on-port-available to switch profiles between 2.0 and 2.1
> >> as headphones are plugged in and out, but in practice,
> >>
> >> - I'm not 100% sure if our "don't switch to HDMI" might prevent
> >> switching from 2.1 to 2.0 when headphones are plugged in, and
> >>
> >> - As the 2.0 profile is available on speakers, that will continue to
> >> be selected when headphones are unplugged.
> >>
> >> So, while this is not directly related to whether there is an LFE
filter
> >> or not - we already have a 2.1, 5.1, etc, profiles - indeed the
problem
> >> might become worse with the LFE filter.
> >
> >
> > Well, I have just tested how today's git version of pulseaudio
(without your patch) behaves when plugging headphones. Yes - the problem
is pre-existing.
> >
> > The PC under test has analog outputs on the back panel that,
theoretically, can be used as analog 5.1 outputs, and also has headphone
and microphone sockets at the front panel.
> >
> > So, the test is:
> >
> > 1. Make sure something (I tested with a cable extender) is plugged
in the line output on the back panel.
> > 2. Select the "analog stereo duplex" profile in pavucontrol.
> > 3. Look at the Playback devices tab. It should say: Port: Line Out
(plugged in).
> > 4. Plug in headphones at the front. Note that the port changes to:
Headphones (plugged in). I.e. exactly as expected.
> > 5. Unplug the headphones, watch how the port changes back to Line
Out (plugged in).
> > 5. Now select the Analog Surround 5.1 + Stereo Input as a profile.
Now the port stays as Line Out (plugged in), but the volume control
becomes 6-channel.
> > 6. Plug headphones in. Result: the port stays as Line Out (plugged
in), with 6-channel volume control, and speaker-test -c6 does not reach
headphones.
> >
> > Sorry, I cannot retest this at home without additional
jack-retasking (which could make the result untrustworthy), because my
home PC does not have any audio sockets at the front panel.
For desktop/notebook which support 5.1 , not all hda codecs have
headphone playback volume control, headphone and front line out share
e.g. those 6 channels hda codec alc662 (e.g dell inspiron 660s or lenovo
think center a58e)
http://www.alsa-project.org/db/?f=d57c2c52e03841877dbb1dba005f9f1ebee43f58
Do this mean that you want the driver to rename "front playback volume"
to "LO + Headphone playback volume" ?
That's not a question that I feel qualified enough to answer definitely,
but, from my viewpoint, for that particular alsa-info, it would make
sense to rename it to "Headphone+LO Playback Volume". Just a different
word order than what you suggested, in order to match what PulseAudio
already recognizes.
Will pulseaudio change back to 5.1/7.1 profile when headphone is
unplugged if user select 5.1 profile before headphone is plugged ?
Currently, it doesn't allow using headphones at all on that PC if a
non-stereo profile is initially selected, so the question is pointless.
It currently can't switch from the stereo profile to 5.1, because it
never switched from 5.1 to stereo. As a user, I would indeed expect it
to switch to the stereo profile when I plug headphones, and switch to
what I selected before (e.g. to 5.1) when I unplug headphones.
The real question is where and how should my preference to use the 5.1
output be stored in PulseAudio without it being lost when I plug my
headphones.
--
Alexander E. Patrakov
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