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
