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[Arkadiy Stepin <2117191@xxxxxxxxxxxxxxxxxx>]

** Package changed: ubuntu => alsa-driver (Ubuntu)

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https://bugs.launchpad.net/bugs/2117191

Title:
  Realtek ALC256 microphone not working on Xiaomi Redmi Book Pro 14
  (2024) — "Microphone (unplugged)" state in Ubuntu 24.04.1

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  On Ubuntu 24.04.1 LTS (kernel 6.x), the built-in microphone on the
  Xiaomi Redmi Book Pro 14 (2024) is not working.

  Symptoms:
  - arecord -l shows the capture device (ALC256 Analog)
  - pactl list sources shows alsa_input.pci-0000_00_1f.3.analog-stereo, but it stays in SUSPENDED
  - pavucontrol reports "Microphone (unplugged)" and provides no other port options
  - Recording with arecord produces silence
  - alsamixer shows Mic Boost and Capture at 100%

  Tried workarounds:
  - Added `options snd_hda_intel model=alc256-*` with various options (dell-headset-multi, acer, asus, lenovo-ideapad)
  - Reinstalled `firmware-sof-signed` and `alsa-ucm-conf`
  - Tried newer kernel (6.8.x)

  No success. It looks like ALC256 GPIO pin config or quirk is missing
  in the driver for this laptop model.

  **Expected result:**
  The internal microphone should be recognized as connected and available for use.

  **Device:**
  Xiaomi Redmi Book Pro 14 (2024), Realtek ALC256, Intel HDA controller.

  Please advise or consider adding proper quirk for this model.

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