Dear ALSA Developers,

I’m reporting an issue with the internal microphone on an ASUS VivoBook (11th Gen Intel Core i7, Realtek ALC256 codec) running Ubuntu 24.04 LTS.

The internal mic is detected by ALSA and PulseAudio/PipeWire, but no audio input is captured, even with max gain and boost. I have tested it on both Ubuntu's default kernel (6.11) and mainline kernel 6.15 — the issue persists.

ALSA detects the codec, and the input pin (0x12) appears to be present, but remains silent.

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

Ubuntu Launchpad bug report: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/2112330

If this requires a model-specific quirk or pin fix, I’m happy to test a patch.

Many thanks, Anas Pauzi