Public bug reported:

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).

alsa-info:
http://alsa-project.org/db/?f=cf6d3ccc6372f955da7d99df07afbcb31d5a6c7f

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

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: alsa internal-mic ubuntu18.04.4lts

** Tags added: internal mic

** Tags added: alsa ubuntu18.04.4lts

** Tags removed: internal mic
** Tags added: internal-mic

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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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