Dear ALSA Developers,
I'm writing to report an issue affecting the internal microphone on the ASUS VivoBook (11th Gen Intel i7, audio codec: Realtek ALC256) under Ubuntu 24.04 LTS using kernel 6.x.
Summary: - Internal microphone is detected by ALSA and PipeWire (input device is listed, RUNNING state) - Volume and boost levels are at 100%, not muted - However, no sound is recorded — mic is completely silent - External USB microphones work fine on the same system
What I’ve tested: - Ubuntu 24.04 default kernel 6.11 → internal mic not working - Mainline kernel 6.15 via mainline tool → still not working - Ubuntu 20.04 (kernel 5.x, likely 5.4 or 5.15 HWE) → **internal mic was working fine**
This suggests a regression or pin configuration issue in recent kernels affecting ALC256 on this laptop.
Here is the full ALSA info dump: https://alsa-project.org/db/?f=6d6466ba903b2e08b351046571e0fc54ddd13981
And here is the related Launchpad bug report: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/2112330
I’d be happy to test a patch or provide additional logs if needed.
Many thanks for your support and your work on ALSA!
Best regards, *Anas Muhamad Pauzi * ASUS VivoBook (11th Gen Intel Core i7, Realtek ALC256)