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[Launchpad Bug Tracker <2117191@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
Realtek ALC256 microphone not working on Xiaomi Redmi Book Pro 14 (2024) — "Microphone (unplugged)" state in Ubuntu 24.04.1
https://bugs.launchpad.net/bugs/2117191
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