The brightness on gnome is controllable, but it does not affect the display brightness on the screen which seems to be stuck on maximum brightness.
The brightness is set to minimum after the laptop has awoken from sleep and cannot be changed.
This is a new installation, I also had some GPU driver issues which seem to be resolved however I’ve just seen the nvidia post, so that might be the cause of the issue?
Here’s some system information.
Linux manjaro 5.9.16-1-MANJARO #1 SMP PREEMPT Mon Dec 21 22:00:46 UTC 2020 x86_64 GNU/Linux
ls /sys/class/backlight
intel_backlight
sudo mhwd
[sudo] password for user:
> 0000:01:00.0 (0302:10de:1c8c) Display controller nVidia Corporation:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-hybrid-intel-nvidia-prime 2020.11.30 false PCI
video-hybrid-intel-nvidia-390xx-bumblebee 2020.11.30 false PCI
video-nvidia 2020.11.30 false PCI
video-nvidia-390xx 2020.11.30 false PCI
video-linux 2018.05.04 true PCI
> 0000:00:02.0 (0300:8086:3e9b) Display controller Intel Corporation:
--------------------------------------------------------------------------------
NAME VERSION FREEDRIVER TYPE
--------------------------------------------------------------------------------
video-hybrid-intel-nvidia-prime 2020.11.30 false PCI
video-hybrid-intel-nvidia-390xx-bumblebee 2020.11.30 false PCI
video-linux 2018.05.04 true PCI
video-modesetting 2020.01.13 true PCI
video-vesa 2017.03.12 true PCI
cat /etc/default/grub
...
Only changed parameters are shown
GRUB_CMDLINE_LINUX_DEFAULT="aspi_override=1 acpi_backlight=intel_backlight"
I’ve also tried these parameters acpi_backlight=vendor
acpi_backlight=native
acpi_backlight=video
acpi_backlight=intel_backlight
then ran the command sudo update-grub