Comment 2 for bug 1856392

Hui Wang (hui.wang) wrote :

"I have no internal mic detected.", that is because the internal mic connects to PCH instead of codec, so it needs the sof driver to enable the internal mic. Please have a try with latest mainline kernel, and upload the dmesg, the dmesg will tell us if your machine need sof driver or not.
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5-rc1/

"When hooking a microphone enabled headphone on the jack plug, the headphones mic is then detected, but there is now no sound output on the headphone.", that should not happen. when you plug a headset, the headphone should be the output device, and the mic on the headset should be in the input device.