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When I plug in my headphone into the (only, so pobably combined out/in) jack in my laptop in Ubuntu 20.04 the config switches output to headphone (I like that) and mic to the non-existing headphone mic (not so).

I can switch the mic back to internal laptop mic in the settings, but it's quite tiring since I plug/unplug them often.

The jack of the headphone has three sections (not four as proper headsets have).

How do I prevent switching to the non-existing mic?

I tried Changing PulseAudio Source port: 'availability=no' and priority but to no avail.

fisch
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1 Answers1

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A combination jack to support headphones, headset or microphone can be retasked to disable the microphone connection in ALSA

If the jack socket is only recognised a headphone connection, the jack-detection function will not change the PulseAudio microphone Port

  1. Install package alsa-tools (if not already installed)

  2. Run the retasking tool from a terminal with root privileges
    sudo hdajackretask

  3. Find the Pin connection relating to the external microphone, enable the Override option and select 'Not Connected' from the drop-down menu

enter image description here

  1. click Install Boot Override

  2. Reboot system and check PulseAudio detects headphone output but not microphone input
    pacmd list-cards

nik gnomic
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    Doesn't seem to work. At first I had to install alsa-tools-gui so I could run hdajackretask. But only the headset was available, not the mic. So there was nothing to turn off. – fisch May 12 '21 at 15:44
  • hdajackretask would usually show a connection for headphones and microphone and could not show multiple pins combined as a headset. My thinking was to use hdajackretask to disable the microphone connection on the TRRS jack so it only supports a TRS headphone connection jack, so PulseAudio could not switch to a microphone Port if it is not recognised – nik gnomic May 15 '21 at 05:19
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    You are right, it says "Black Headphone, Front side", not headset. But besides the Internal Mic and Internal Speaker I don't have the Mic in the list. Thanks for your idea though! – fisch May 16 '21 at 08:38