Public bug reported:

Hello,
on a brand new HPZbook15G6, with a fresh dual boot 19.10 Ubuntu install, I have 
no internal mic detected.
The GNOME settings sound entry list is empty. Speaker sound is working properly.

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.

I've been looking for a few similar issues on recent (HP or not) laptops
and found a few similar issues :

Bug #1523100
Bug #1837821

so I guess this is a generic alsa or snd-hda-intel issue with newer ALC2xx 
hardware.
I already tryed quite a few of the workaroubds/fix available here and there 
(e.g. overriding pin with hdajackretask, adding options to snd-hda-intel module 
etc. none with success)

I'm available to test/provide any additional needed data.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  mathieu    1719 F.... pulseaudio
 /dev/snd/controlC0:  mathieu    1719 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Dec 14 13:33:14 2019
InstallationDate: Installed on 2019-12-13 (0 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
Symptom_Card: Audio interne - HDA Intel PCH
Symptom_Jack: Black Mic, Right
Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH 
successful
Symptom_Type: Only some of inputs are working
Title: [HP ZBook 15 G6, Realtek ALC285, Black Mic, Right] Recording problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/06/2019
dmi.bios.vendor: HP
dmi.bios.version: R92 Ver. 01.03.04
dmi.board.name: 860F
dmi.board.vendor: HP
dmi.board.version: KBC Version 65.23.00
dmi.chassis.asset.tag: 5CD944676Z
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: 
dmi:bvnHP:bvrR92Ver.01.03.04:bd11/06/2019:svnHP:pnHPZBook15G6:pvr:rvnHP:rn860F:rvrKBCVersion65.23.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP ZBook
dmi.product.name: HP ZBook 15 G6
dmi.product.sku: 6VD99AV
dmi.sys.vendor: HP
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2019-12-14T13:26:02.404591

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


** Tags: amd64 apport-bug eoan

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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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