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FS#68608 - [sof-firmware?]Low microphone input on Intel CometLake (Lenovo X1 Extreme gen 3)

Attached to Project: Arch Linux
Opened by nicolas dechesne (ndec) - Friday, 13 November 2020, 09:59 GMT
Last edited by Andreas Radke (AndyRTR) - Wednesday, 21 April 2021, 12:24 GMT
Task Type Bug Report
Category Packages: Extra
Status Assigned
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No



Just installed Archlinux on a brand new Lenovo X1 Extreme gen 3. After install sof-firmware, the sound card shows us fine. Audio playback (speaker and headset) works fine. For audio record, I can see the following input sources in Pulseaudio:
* Comet Lake PCH cAVS Headphone Stereo Microphone
* Comet Lake PCH cAVS Headphone Digital Microphone

Using any application to record audio (or webrtc), I am seeing:

1. the digital microphone works fine, and it corresponds to a mic array "around the display", but it captures a lot of the sound in the room
2. the stereo microphone, once my analog headset is connected, has very low input volume, even if I max out all volumes in pulse, the audio is very low, and barely audible

The headset is a Bose QC25 and it works fine on the same machine with Windows, and on another Lenovo T460s running Archlinux as well. So the headset is not the issue.

I have found many reports of audio issues with recent intel audio, but most of the time it's an old kernel (before snd-sof) or missing sof firmware, which is not the issue here. I haven't found any report of 'low volume' yet.

Additional info:
I have done a full reinstall yesterday, so all packages are up-to-date.

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