Microphone doesn't work

[<sterbl.ta@tutanota.com>]

Don't know how to explain my problem (probably because I am not familiar with hardware and sound relation setting). Apology if description of my problem looks incompletely. My problem is when attending the online meeting, my laptop's microphone never worked at all.

My laptop is HP 840 G5, and its audio should be https://support.hp.com/us-en/document/c05903000#AbT9

Environment I use:

kernel: 5.2.0-2-amd64

Debian version: bullseye/sid

arecord --list-devices shows

**** List of CAPTURE Hardware Devices ****

card 0: PCH [HDA Intel PCH], device 0: CX8200 Analog [CX8200 Analog]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

Checking alsamixer, it looks like ok because microphone is turned on

https://imgur.com/fPBFMZo

https://imgur.com/e9Bbavf

https://imgur.com/2IQxVQd

Following the instruction at https://linuxconfig.org/how-to-test-microphone-with-audio-linux-sound-architecture-alsa for testing my microphone.

1. Record sound produced by microphone

arecord -d 10 /tmp/test-mic.wav

2. Reply the sound recorded 

aplay /tmp/test-mic.wav

I am sure I can hear the sound produced by my microphone.

Unfortunately when attending all the meeting (such as google meets), even with permission is granted (allowing microphone and camera to be used temporary) my microphone never function (so people in the meeting never heard my voice).

I suppose this could be something I miss or I am not aware. But the problem i do not know where to check the possible root cause, and fix it.

I appreciate any suggestions!