[pulseaudio-discuss] Profile switching on headphone plugging (was: LFE filter)

[Raymond Yau]

> >
> >> 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" ?

Will pulseaudio change back to 5.1/7.1 profile when headphone is unplugged
if user select 5.1 profile before headphone is plugged ?
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