Comment 25 for bug 1846148

Please install and test this kernel, at least you could see the internal mic, and maybe the internal mic can work.

https://people.canonical.com/~hwang4/redmi/v1/

And please also test the external mic.

If they don't work as expected, please collect an alsa-info.txt with coeff enabled.

sudo su
echo 1 > /sys/module/snd_hda_codec/parameters/dump_coef
Then run alsa-info to collect alsa-info.txt.

thx.