Re: Internal microphone not working on ThinkPad T490 (Realtek ALC257 / Intel SST)

this is common with various newer laptops, I haven't heard of anyone 
working on a driver for these (this would probably want to use 
soundopenfirmware as a base, most is under licences we can use).

workaround would be to use a headset with mic via the 3.5mm TRRS connector 
or a USB-connected mic with audio(4).

-- 
  Sent from a phone, apologies for poor formatting.

On 25 May 2026 11:35:33 [email protected] wrote:

> Category: kernel
> Synopsis: Internal microphone not working on ThinkPad T490 (Realtek ALC257 
> / Intel SST)
> Description: Internal microphone produces no audio on ThinkPad T490 running 
> OpenBSD 7.9. kern.audio.record=1, all mixer settings correct, all record 
> channels unmuted. Recording produces files with Maximum amplitude 0.000000. 
> The internal mic is routed through Intel Smart Sound Technology (SST), not 
> the azalia HD audio codec. OpenBSD has no driver for Intel SST.
> How-To-Repeat: sox -t sndio default test.wav trim 0 3 && sox test.wav -n 
> stat shows Maximum amplitude 0.000000
> Fix: Driver needed for Intel Smart Sound Technology (SST) chip.
> Hardware: Lenovo ThinkPad T490, azalia0 codecs: Realtek ALC257, OpenBSD 7.9 
> amd64