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Dim backlight in Intel Graphics based Laptops running Ubuntu 18.04 (Gnome or Budgie)
Open a terminal and run the following commands (cd to your home directory first)
sudo apt install xbacklight
xauth generate :0 . trusted
xauth add ${HOST}:0 . $(xxd -l 16 -p /dev/urandom)
sudo vi /etc/udev/rules.d/98-backlight.rules
Paste the following into the 98-backlight.rules
################################################# START ###################################
# Adjust screen brightness according to power state
# 1st rule for when on AC
ACTION=="change", SUBSYSTEM=="power_supply", ATTR{type}=="Mains", ATTR{online}=="1", ENV{DISPLAY}=":0", ENV{XAUTHORITY}="/home/USERNAME/.Xauthority", RUN+="/usr/bin/xbacklight -set 85"
# 2nd rule for when on battery
ACTION=="change", SUBSYSTEM=="power_supply", ATTR{type}=="Mains", ATTR{online}=="0", ENV{DISPLAY}=":0", ENV{XAUTHORITY}="/home/USERNAME/.Xauthority", RUN+="/usr/bin/xbacklight -set 30"
################################################# END ######################################
sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf
Paste the following into 20-intel.conf
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
~
REBOOT
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