Microphone not working on Ubuntu 20.04 KDE Plasma with pulseaudio and pavucontrol installed

Question

Microphone is not working on my desktop. What I have tried to:

1. Reinstalled alsa-base pavucontrol pulseaudio. This changed nothing

sudo apt removeauto --purge alsa-base pavucontrol pulseaudio

sudo reboot

sudo apt install alsa-base pavucontrol pulseaudio

2. Removed pavucontrol and pulse audio. And then micro started working, but no sound control and started to appear error Error loading QML file: file:///home/noah/.local/share/plasma/plasmoids/org.kde.plasma.audiodeviceswitcher/contents/ui/main.qml:29:1: module "org.kde.plasma.private.volume" is not installed

3. Installed pavucontrol and pulseaudio, rebooted and then sound control came back, error disappeared, but micro stopped working again

Solution

Ok, so this is what fixed this issue for me

1. Run command pavucontrol or just open pavu volume control in apps
2. Go to 'Input Devices'
3. Scroll down to 'Built-in Audio Analog Stereo'
4. Click on lock icon
5. Set 'Front Right' slider to zero
6. Adjust 'Front Left' so you get clean sound

I think that you may try to go with 'Front Left' to zero instead, based on you mic.

Comments

[alexanderadam]

I have an external microphone that stopped working with Ubuntu 20.04 but worked fine before. I'm sure it's a bug. Please mention me if you found a corresponding bug issue. ;)

[AidOnline01]

@alexanderadam, have you tried my solution bellow?

[alexanderadam]

Yes I did. This wasn't my problem though. In my case the microphone isn't always recognized since 20.04.

[Vlad Nitu]

In my case I solved the problem with this answer.