So, It looks like we need to set some coeff to make the internal mic
work, but only Realtek engineers know how to set the coeff registers.

And do one more test for external mic:

run sudo hdajacksensetest -a
plug the headset or external mic
run sudo hdajacksensetest -a  again

upload the output-before.txt and output-after.txt.

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  Realtek ALC256M with DTS Audio Processing internal microphone doesn't
  work on Redmi Book 14 2019

Status in alsa-driver package in Ubuntu:

Bug description:
  Sound works okay but the internal mic doesn't work.
  When I plug in headset, the mic on headset also doens't work.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.0.0-29.31~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-29-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
   /dev/snd/controlC0:  lilian     1689 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct  1 12:27:10 2019
  InstallationDate: Installed on 2019-09-21 (9 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Title: PCI/internal sound card not detected
  UpgradeStatus: No upgrade log present (probably fresh install) 08/19/2019
  dmi.bios.vendor: TIMI
  dmi.bios.version: RMRCM400P0100 TM1901
  dmi.board.vendor: TIMI
  dmi.chassis.type: 10
  dmi.chassis.vendor: TIMI
dmi:bvnTIMI:bvrRMRCM400P0100:bd08/19/2019:svnTIMI:pnRedmiBook14:pvr:rvnTIMI:rnTM1901:rvr:cvnTIMI:ct10:cvr: Mi Laptop RedmiBook 14
  dmi.product.sku: TM1901-24822
  dmi.sys.vendor: TIMI

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