If you are unhappy with default backlight brightness regulation of your Intel graphics-based laptop (too bright at lowest level and burn your eyes at night), you can try this script.

Instead of going straight to the "Brightness" setting, which you understandably want to do, play with the "Backlight" ...

sudo su -c 'echo SUBSYSTEM==\"backlight\", RUN+=\"/bin/chmod 0666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power\" > /etc/udev/rules.d/99 ...