The behavior is different with the test kernel. please find the
screenshot and the alsa-info below.

** Attachment added: "Screenshot from 2019-10-20 18-18-34.png"

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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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