On Mon, Oct 05, 2026 at 03:52:55PM +0200, Stefano L wrote:
> Internal microphone on ThinkPad T490 (azalia0, Realtek ALC257) records 
> silence. Playback works.
> 
> How to repeat: run aucat -o /tmp/mic.wav, speak, stop with Ctrl-C, play back 
> with aucat -i /tmp/mic.wav. The recording is silent. Same result with the 
> headphone jack unplugged.
> 
> State: kern.audio.record=1, input.mute=0, input.level=1.000, 
> inputs.mic=255,255, record.adc-0:1_source=mic, 
> record.adc-2:3_source=mic2,mic, record.adc-4:5_source=mic2, 
> outputs.mic2_sense=unplugged.
> 

Is this a phone headset or just headphones?

Could you send the full mixerctl output and the complete dmesg output?

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