Confirmed to be an hardware problem... Sorry for the inconveninence.
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https://bugs.launchpad.net/bugs/1899764
Title:
[Realtek ALC257][Lenovo T14 Gen1] Internal mic or headset mic not
After further investigations, the problem could come from the computer
itself.
I finished my distro / kernel tests with a windows installation, and I
discovered that the mic is still unavailable...
Sorry for the inconvenience, I think you can close this ticket. I am
going to bring in the on-site
Public bug reported:
Hello,
I've received a brand new Lenovo T14 Gen 1 (Intel), that suffers of some
incompatibilities with Ubuntu.
The internal mic is not detected (only analog input is displayed). And
when a headset is plug, only the output works.
I've tried lots of alsa-base.conf
