After many hours of tinkering around, I made the headset with microphone
to be fully recognized and working on Dell Latitude 7389! The
combination was to set pin 0x21 to "Headphones" as Jeff metioned using
hdajackretask. Then, setting the ALSA config to model "alc256-asus-mic"
adding "options
I can confirm this still occurs in Ubuntu 20.04 on my Dell Latitude 7389 (also
using ALC3253).
On a fresh install, the audio jack does not even recognize when a headset is
connected at all. After following Jeff Conner suggestion on comment #5, it now
recognizes them and sound output works as
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