you may need to open an upstream bug report at

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers


it is pulseaudio  module-switch-on-port-available which change the input source 
when the jacks are not plugged

for the workaround, you may try disable Jack detection by hint using
early patching

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


The generic parser supports the following hints:

- jack_detect (bool): specify whether the jack detection is available
  at all on this machine; default true

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https://bugs.launchpad.net/bugs/1365769

Title:
  [G41MT-S2P, VIA VT2020, Pink Mic, Rear] No sound at all

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