This also affects me. HP Spectre Folio AK13. I added  
 options snd-hda-intel dmic_detect=0
 options snd-hda-intel index=0 model=laptop-dmic
as descrived above.
Now the sound works (again, it worked initially after install). Mic shows up 
after adding the last line and the sound works (again), though as "back-mic 
built-in" (in norwegian Bak-mikrofon - Innebygd enhet) in Settings - Sounds.
 
arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC285 Analog [ALC285 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Running 19.10 with the latest kernel updates (as of today).

It would be really nice to have working microphone now with the lockdown
and everything.

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https://bugs.launchpad.net/bugs/1840725

Title:
  Microphone not working in Ubuntu 18.04.3 LTS on new hp-
  spectre-x360-convertible-15 laptop

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