@rcassini - that is what the modification I suggested also does.

To get back towards Pulsaaudio though, I did pay more attention to
differen platforms. It occured to my that Mac OS also isn't capable of
detecting what type of jack is plugged in, but still manages to make a
decent automatic choice.

I noticed that:

- When I plug in headphones, it uses the internal mic -> OK
- When I plug a simple headset, it switches to headset mic -> OK
- When I plug in a more advanced headset with mute control that is unmuted, it 
still switches to headset mic -> OK
- When I plug in this same headset with the mic muted, it remains on internal 
mic -> questionable, but makes sense. When I then unmute, it still switches to 
headset mic.

So it seems to actually poll the wires for a signal, and if any input
that looks like a mic is coming through, it switches. So when it's
muted, no signal comes through and it assumes it's a headset.

Simple and clever, and usually what you want. The main drawback is that
this may lead to a situation where you think you're muted but you're
actually not muted because it uses the internal mic which isn't muted.

Still, something that I'd like to see implemented in Pulseaudio as well!

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https://bugs.launchpad.net/bugs/1876056

Title:
  No automatic switch to headset microphone on connect

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