Comment 0 for bug 1912052

Recently, external microphone has stopped working while using classic wired audio combo jack headset.

Basics:

1) Headset's microphone works fine both in MS Windows on the same machine and on older Xubuntu on another machine.
2) Internal laptop mic works normally.
3) Yes, I have mic unmuted in settings.

I've followed whole step1 from this troubleshoot guide:
https://help.ubuntu.com/community/SoundTroubleshootingProcedure

Did not help.

There are more informationhttps://askubuntu.com/questions/1305942/external-headset-microphone-not-working-on-ubuntu-20-10-not-even-wired-cable-h with screenshot here:

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: pulseaudio 1:13.99.2-1ubuntu2.1
ProcVersionSignature: Ubuntu 5.8.0-38.43-generic 5.8.18
Uname: Linux 5.8.0-38-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: crysman 2301 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Jan 16 13:31:13 2021
InstallationDate: Installed on 2020-06-19 (210 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to groovy on 2020-12-08 (38 days ago)
dmi.bios.date: 07/17/2020
dmi.bios.release: 1.5
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.05
dmi.board.name: Caboom_IL
dmi.board.vendor: IL
dmi.board.version: V1.05
dmi.chassis.type: 31
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.05
dmi.ec.firmware.release: 1.2
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.05:bd07/17/2020:br1.5:efr1.2:svnAcer:pnSpinSP513-54N:pvrV1.05:rvnIL:rnCaboom_IL:rvrV1.05:cvnAcer:ct31:cvrV1.05:
dmi.product.family: Spin 5
dmi.product.name: Spin SP513-54N
dmi.product.sku: 0000000000000000
dmi.product.version: V1.05
dmi.sys.vendor: Acer