Bug#944356: udev: fn keys for dim/brightness on ProBook g6 not recognised

[kwadronaut - debian]

Package: udev
Version: 241-7~deb10u1
Severity: normal

Dear Maintainer,

typical laptop 'extra' keys aren't properly working, both dim and
brighter buttons get registered identical as mic on/off. I've checked
upstream's git changes:
https://github.com/systemd/systemd/commits/master/hwdb/60-keyboard.hwdb
(and they moved the file last month, checked there too). Latest Bios,
using default Wayland/Gnome.

sudo showkey -s
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
0x9c 
0x5a 0xda 
0x5a 0xda 
0x5a 0xda 

When doing this, nothing gets output, but gnome shows the mic on/off:

sudo evtest /dev/input/event5
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)

I've given it a try with Qubes on X instead of Wayland, tried without an
X-server: all the same, not sure how to debug further.

-- Package-specific info:

-- System Information:
Debian Release: 10.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-6-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages udev depends on:
ii  adduser       3.118
ii  dpkg          1.19.7
ii  libacl1       2.2.53-4
ii  libblkid1     2.33.1-0.1
ii  libc6         2.28-10
ii  libkmod2      26-1
ii  libselinux1   2.8-1+b1
ii  libudev1      241-7~deb10u1
ii  lsb-base      10.2019051400
ii  systemd-sysv  241-7~deb10u1
ii  util-linux    2.33.1-0.1

udev recommends no packages.

udev suggests no packages.

Versions of packages udev is related to:
ii  systemd  241-7~deb10u1

-- no debconf information

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I feel a bit violated that reportbug wants to add over 7000 lines of
identifiable hardware.
I'm happy to dig up and share *relevant* parts, please tell me.

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