[pulseaudio-tickets] [Bug 68286] Support toggling speaker and headphone port output, whilst keeping headphones plugged in

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68286

--- Comment #1 from Raymond <superquad.vortex2 at gmail.com> ---

http://www.intel.com/support/motherboards/desktop/sb/CS-034206.htm


to enable multi streaming, you have to use hints indep_hp=true

instead of retasking line in as another headphone

need the conference application allow you to select alt analog playback device 

http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio.txt


Hint Strings
~~~~~~~~~~~~
The codec parser have several switches and adjustment knobs for
matching better with the actual codec or device behavior.  Many of
them can be adjusted dynamically via "hints" strings as mentioned in
the section above.  For example, by passing `jack_detect = no` string
via sysfs or a patch file, you can disable the jack detection, thus
the codec parser will skip the features like auto-mute or mic
auto-switch.  As a boolean value, either `yes`, `no`, `true`, `false`,
`1` or `0` can be passed.

The generic parser supports the following hints:


- indep_hp (bool): provide the independent headphone PCM stream and
  the corresponding mixer control, if available


http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio-Controls.txt

* Independent HP
  When this enum control is enabled, the headphone output is routed
  from an individual stream (the third PCM such as hw:0,2) instead of
  the primary stream.

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