On a desktop, it is possible for a user to connected output of a TV card
to line in (blue jack) so that you can hear the output from the speaker
connected to the green jack.

This mean that user may not want  to select line in as input source
automatically when the jack is plugged into blue jack

Unlike the expected behavior of the notebook user, plugged in the
external mic which automatically disabled the internal mic.

Beside hda support multistream capture, some hda controller allow using
front mic and rear mic at the same time by different application.

It is possible to have a GUI to disable the auto switch on available
port for sink and source

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https://bugs.launchpad.net/bugs/1004607

Title:
  pulseaudio switches microhpones randomly

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