I installed elementary on my new PC and the. To make everything work I followed this tuto
For my hotkeys I modified
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
after I created the file
# begin file contents Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection # end file contents
Now when I use my hotkeys to adjust the brightness, the indicator changes but not the brightness.