The internal microphone is unlikely to work because the onboard audio codec is using the snd_hda_intel driver instead of one of the Sound Open Firmware drivers snd_soc_skl,snd_sof_pci
Device-1: Intel Cannon Lake PCH cAVS driver: snd_hda_intel v: kernel
alternate: snd_soc_skl,snd_sof_pci bus-ID: 00:1f.3 chip-ID: 8086:a348
The snd_hda_intel driver does not support internal digital microphone array
Kernel v5.9 has been marked End Of Life here for a while now
users are recommended to change to kernel v5.10 or later
You can use manjaro-settings-manager -m msm_kernel to install kernels in a GUI
Please post full responses to
inxi -Fazy
and
sudo alsa-info.sh --upload