[Bug 2112330] Re: Internal microphone not working on ASUS VivoBook with Realtek ALC256 (Ubuntu 24.04 + kernel 6.15)

Hardware: ASUS VivoBook X513EA
Audio Codec: Realtek ALC256 (HDA Intel PCH)
Ubuntu Version: 24.04.3 LTS (Noble)
Kernel Tested: 6.14.0-1011-oem
Result: Built-in microphone still not working

Verification details:
– Confirmed using alsamixer that both "Internal Mic" and "Internal Mic B" appear under Capture view.
– Both were unmuted and raised to ~80%.
– Tested with arecord -f cd -d 5 test.wav and aplay test.wav → no audio recorded.
– "Headset Mic" input works normally (tested separately).

ALSA Info: http://alsa-
project.org/db/?f=4b96829b52f7b19fdd003c66b11818ceaabb693c

Additional technical note:
The codec dump shows two possible mic pins:
– Pin 0x19: "Internal Mic" (analog) – appears unused.
– Pin 0x1a: "Internal Mic B" (digital array mic) – likely the actual built-in mic connection.

It seems the fix introduced in 6.14.0-1011-oem remaps only pin 0x19,
whereas this VivoBook X513EA uses pin 0x1a for the internal mic.

Marking as verification-failed (noble).

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https://bugs.launchpad.net/bugs/2112330

Title:
Internal microphone not working on ASUS VivoBook with Realtek ALC256
(Ubuntu 24.04 + kernel 6.15)

Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Plucky:
Fix Released
Status in linux source package in Questing:
Confirmed

Bug description:
[Impact]
On various ASUS Vivobook with Realtek audio codec ALC256, the audio input device will disappear thus the microphone does not work anymore. It happens after this commit 3b4309546b48 ("ALSA: hda: Fix headset detection failure due to unstable sort") on 6.14-rc1.

[Fix]
Backported patches for ASUS Vivobook which use the correct fixup which is not affected by the order problem caused by commit 3b4309546b48 ("ALSA: hda: Fix headset detection failure due to unstable sort")

[Test Case]
1. Get ASUS Vivobook laptops and boot up.
2. Check if the audio input device exist
3. use `arecord` to record sound with the microphone

[Where problems could occur]
They are only quirked for ASUS Vivobook SSIDs with ALC256. Should have no impact for other platforms. The risk should be low.


========== original bug description ==========
I'm using an ASUS VivoBook (11th Gen Intel i7, Realtek ALC256 audio codec). On Ubuntu 24.04.2 LTS, the internal microphone is detected and listed correctly in PulseAudio/PipeWire and ALSA, but no input is captured. Microphone volume and boost are set to 100%, not muted. Input device appears as RUNNING in pactl, but no signal is recorded.

I tested:
- Ubuntu 24.04 with default kernel (6.11)
- Upgraded to mainline kernel 6.15 via `mainline` tool
- ALSA, PipeWire, PulseAudio all installed and working
- External USB mic works perfectly
- BIOS does not expose any audio/microphone control
- Mic also tested with `pw-record`, `arecord`, `gnome-sound-recorder` — all silent

ALSA info:
https://alsa-project.org/db/?f=6d6466ba903b2e08b351046571e0fc54ddd13981

It seems like a pin configuration or unsupported codec issue with
ALC256. Please advise if this requires a patch or model-specific
quirk.

Thank you.

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