[Bug 1806343] Re: FN+F3/F4 does not modify keyboard backlight brightness.

Please boot without any workaround, then attach "acpidump" here, thanks!

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https://bugs.launchpad.net/bugs/1806343

Title:
FN+F3/F4 does not modify keyboard backlight brightness.

Status in linux package in Ubuntu:
Confirmed

Bug description:
acpi_listen does not output anything to terminal when pressing key
combination.

Keyboard backlight has worked on older versions (I believe 18.04 or
earlier.)

I can manually toggle with:

echo 0 | sudo tee --append /sys/class/leds/asus\:\:kbd_backlight_1/brightness
echo 1 | sudo tee --append /sys/class/leds/asus\:\:kbd_backlight_1/brightness
echo 2 | sudo tee --append /sys/class/leds/asus\:\:kbd_backlight_1/brightness
echo 3 | sudo tee --append /sys/class/leds/asus\:\:kbd_backlight_1/brightness

for varying degrees of brightness.
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu14
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2018-11-28 (4 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181128)
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
Tags: disco
Uname: Linux 4.19.6-041906-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom debian-tor dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu14
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: duck 3632 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2018-11-28 (22 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181128)
MachineType: ASUSTeK COMPUTER INC. GL502VMK
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-11-generic root=/dev/mapper/vg0-root ro quiet splash acpi_osi= acpi_backlight=native vt.handoff=1
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
RelatedPackageVersions:
linux-restricted-modules-4.18.0-11-generic N/A
linux-backports-modules-4.18.0-11-generic N/A
linux-firmware 1.176
Tags: disco
Uname: Linux 4.18.0-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom debian-tor dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/03/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: GL502VMK.305
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: GL502VMK
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrGL502VMK.305:bd07/03/2017:svnASUSTeKCOMPUTERINC.:pnGL502VMK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnGL502VMK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: GL
dmi.product.name: GL502VMK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

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