Additionally I tested "event16", but there was no reaction (doesn't
matter if using Fn + key combinations or when using Fn lock):



$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:      Sleep Button
/dev/input/event1:      Lid Switch
/dev/input/event2:      Power Button
/dev/input/event3:      Power Button
/dev/input/event4:      AT Translated Set 2 keyboard
/dev/input/event5:      Video Bus
/dev/input/event6:      SynPS/2 Synaptics TouchPad
/dev/input/event11:     HP Wireless hotkeys
/dev/input/event12:     HP HD Camera: HP HD Camera
/dev/input/event13:     HP HD Camera: HP IR Camera
/dev/input/event14:     SYNA307B:00 06CB:CD46 Touchpad
/dev/input/event15:     ST LIS3LV02DL Accelerometer
/dev/input/event16:     HP WMI hotkeys
/dev/input/event17:     HDA Intel PCH Mic
/dev/input/event18:     HDA Intel PCH Headphone
/dev/input/event19:     HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event20:     HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event21:     HDA Intel PCH HDMI/DP,pcm=8
/dev/input/event22:     HDA Intel PCH HDMI/DP,pcm=9
/dev/input/event23:     HDA Intel PCH HDMI/DP,pcm=10
/dev/input/event24:     MX Master 3 Keyboard
/dev/input/event25:     MX Master 3 Mouse
Select the device event number [0-25]: 16
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x0 version 0x0
Input device name: "HP WMI hotkeys"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 138 (KEY_HELP)
    Event code 141 (KEY_SETUP)
    Event code 148 (KEY_PROG1)
    Event code 153 (KEY_DIRECTION)
    Event code 224 (KEY_BRIGHTNESSDOWN)
    Event code 225 (KEY_BRIGHTNESSUP)
    Event code 226 (KEY_MEDIA)
    Event code 240 (KEY_UNKNOWN)
    Event code 358 (KEY_INFO)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
  Event type 5 (EV_SW)
Properties:
Testing ... (interrupt to exit)

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https://bugs.launchpad.net/bugs/1852071

Title:
  [HP ZBook Studio G5, Ubuntu 18.04.3 LTS] Brightness function keys
  works as microphone mute function keys

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  1. Press fn+F3.
  Ubuntu shows "Internal microphone" turned off OSD pop-up.
  Should turn the brightness down.
  2. Press fn+F3 again.
  Ubuntu shows "Internal microphone" turned on OSD pop-up.
  Should turn the brightness down.

  1. Press fn+F4.
  Ubuntu shows "Internal microphone" turned off OSD pop-up.
  Should turn the brightness up.
  2. Press fn+F4 again.
  Ubuntu shows "Internal microphone" turned on OSD pop-up.
  Should turn the brightness up.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21
  Uname: Linux 5.0.0-32-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Nov 11 13:23:56 2019
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Device [8086:3e9b] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:8428]
  InstallationDate: Installed on 2019-04-02 (223 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 138a:00ab Validity Sensors, Inc.
   Bus 001 Device 002: ID 05c8:0808 Cheng Uei Precision Industry Co., Ltd 
(Foxlink)
   Bus 001 Device 004: ID 8087:0aaa Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HP HP ZBook Studio G5
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-32-generic 
root=UUID=d12790df-696c-4d0c-aefa-b0e53712e2ce ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/15/2019
  dmi.bios.vendor: HP
  dmi.bios.version: Q71 Ver. 01.08.00
  dmi.board.name: 8427
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 16.3A.00
  dmi.chassis.asset.tag: 5CD91018X5
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrQ71Ver.01.08.00:bd07/15/2019:svnHP:pnHPZBookStudioG5:pvr:rvnHP:rn8427:rvrKBCVersion16.3A.00:cvnHP:ct10:cvr:
  dmi.product.family: 103C_5336AN HP ZBook Studio
  dmi.product.name: HP ZBook Studio G5
  dmi.product.sku: 2YN61AV
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1ubuntu1~18.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~18.04.3
  version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.8-0ubuntu0~18.04.3
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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