alsa-project/alsa-firmware issue #9 was opened from achallion:

i am using pop os in acer nitro 5 and codec is Realtek ALC287. Earlier everything was working fine but after certain update, my headset mic stopped to get detected in my linux though we can hear sound through it. Everything else is working fine.

Issue URL : https://github.com/alsa-project/alsa-firmware/issues/9 Repository URL: https://github.com/alsa-project/alsa-firmware