I am on the HP 830 G6 and with 'options snd-hda-intel index=0 model
=laptop-dmic' I finally see the microphone appearing in pavucontrol.
However, I cannot get the microphone/input working.

Currently, I have the following lines added to make at least output
sound working and *see* the microphone in pavucontrol:

options snd-hda-intel dmic_detect=0
options snd-hda-intel index=0 model=laptop-dmic

My system is as follow:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 19.10
Release:        19.10
Codename:       eoan

$ inxi -Fxz
Audio:     Device-1: Intel Cannon Point-LP High Definition Audio vendor: 
Hewlett-Packard driver: snd_hda_intel v: kernel 
           bus ID: 00:1f.3 
           Sound Server: ALSA v: k5.3.0-42-generic 

$ uname -a
Linux hostname 5.3.0-42-generic #34-Ubuntu SMP Fri Feb 28 05:49:40 UTC 2020 
x86_64 x86_64 x86_64 GNU/Linux

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.

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

Status in alsa-driver package in Ubuntu:

Bug description:
  Internal Microphone does not work in Ubuntu 18.04.3 LTS in a new hp-
  spectre-x360-convertible-15 laptop. The microphone works perfectly on
  Windows 10 (present in Dual boot mode).

  Initially, Internal Microphone was not even detected but installing
  alsa-tools-gui and overriding pin 0x12 to the Internal Microphone
  fixed that issue. [Pin 0x13 does not work and causes static in a
  headphone if it is plugged in.]

  Microphone is not able to pick up any sound. I changed levels/settings in 
alsamixer, pavucontrol without any success:
  In alsamixer: Experimented with levels ranging from very low to very high for 
Internal Mic, Capture, etc.
  In pavucontrol: Set the Internal Mic as a fallback device, unlocked the 
channels for the mic, experimented with reducing the level for one of the 
channels (reduced right mic level to Silence while keeping the left mic level 
normal/high and vice versa).


  arecord -l
  **** List of CAPTURE Hardware Devices ****
  card 0: PCH [HDA Intel PCH], device 0: ALC285 Analog [ALC285 Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0

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