"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.

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https://bugs.launchpad.net/bugs/1856392

Title:
  [HP ZBook 15 G6, Realtek ALC285, Black Mic, Right] Microphone not
  detected

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