1. installed as the order below:
sudo dpkg -i linux-image-xxx.deb
sudo dpkg -i linux-modules-xxxx.deb
sudo dpkg -i linux-modules-extra-xxx.deb

2. restart and boot to the test kernel.

3. Open settings and find Input tag from Sound. 
- The internal mic was not visible

3. insert the external mic
- It appears as "Microphone - BuiltinAudio"
- unplug it, still appears as "Microphone - BuiltinAudio"

4. Test recording for no external mic case:
- Only random electric noise.

5. Test recording for external mic case
- Only random electric noise.

Attached alsa-info.ext collected

** Attachment added: "alsa-info.txt.cX0MHoMXkI"

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.

  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)
  dmi.bios.date: 08/19/2019
  dmi.bios.vendor: TIMI
  dmi.bios.version: RMRCM400P0100
  dmi.board.name: TM1901
  dmi.board.vendor: TIMI
  dmi.chassis.type: 10
  dmi.chassis.vendor: TIMI
  dmi.product.family: Mi Laptop
  dmi.product.name: RedmiBook 14
  dmi.product.sku: TM1901-24822
  dmi.sys.vendor: TIMI

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