How to disable auto adjustment of internal laptop microphone on Linux

1. Get source name with pacmd list-sources | grep name:

Sample output:

name: <alsa_output.pci-0000_00_1b.0.analog-stereo.monitor>
name: <alsa_input.pci-0000_00_1b.0.analog-stereo>

2. You need to remap

pacmd load-module module-remap-source master=alsa_input.pci-0000_00_1b.0.analog-stereo source_name=mono channels=1 channel_map=right

3. And add at the end of the file /etc/pulse/default.pa the same line as in step 2 but without the pacmd

load-module module-remap-source master=alsa_input.pci-0000_00_1b.0.analog-stereo source_name=mono channels=1 channel_map=right
# if you want make the mono source default
set-default-source mono

4. Reboot

Thanks to u/JuggleTux for solving this problem.