The above hint…
As root, edit "/etc/modprobe.d/alsa-base.conf", add "options snd-hda-intel model=dell-headset-multi" to the end of it, and then reboot.
…for the microphone input on the 3.5mm jack did not work for me. My TRS (jack with two black rings) microphone still does not work :-( Though, several of my TRRS (jack with three black rings) headsets do work just fine.—Even without changing the default kernel module configuration.
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