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
