Microphone not working, Sennheiser headset HD 4.40 Bluetooth, on Ubuntu 20.04

I have connected a Sennheiser headset HD 4.40 Bluetooth to Ubuntu 20.04 but its microphone is not working. I can see it on the audio configuration window but the test bar does not move at all, it does not detect any audio. The headphones are working OK.

I am using a Plugable USB 2.0 Bluetooth adapter:

Bus 001 Device 002: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0

Any ideas about how to fix this?

3

1 Answer

I have fixed this by unpairing ("Remove device") the headset and pairing it again. Initially Ubuntu microphone test bar did not move at all, but I tried in an application and the mic worked, and when going back to Ubuntu sound window the mic bar was detecting sound.

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