Script to run when AC power supply state changes

configure_ac_change_script.sh

#!/bin/sh

# create udev rule
sudo tee "/etc/udev/rules.d/60-ac-or-battery-change.rules" > /dev/null <<'EOF' 
# Rule for when switching to battery
ACTION=="change",SUBSYSTEM=="power_supply",ENV{POWER_SUPPLY_ONLINE}=="0",ENV{DISPLAY}=":1",ENV{XAUTHORITY}="/run/user/1000/gdm/Xauthority",ENV{DBUS_SESSION_BUS_ADDRESS}="unix:path=/run/user/1000/bus",RUN+="/usr/bin/su niccola -c '/usr/bin/ac_change.sh 0'"

# Rule for when switching to powersupply
ACTION=="change",SUBSYSTEM=="power_supply",ENV{POWER_SUPPLY_ONLINE}=="1",ENV{DISPLAY}=":1",ENV{XAUTHORITY}="/run/user/1000/gdm/Xauthority",ENV{DBUS_SESSION_BUS_ADDRESS}="unix:path=/run/user/1000/bus",RUN+="/usr/bin/su niccola -c '/usr/bin/ac_change.sh 1'"
EOF

# Create script to run when AC power supply change state
sudo tee "/usr/bin/ac_change.sh" > /dev/null <<'EOF'
#!/usr/bin/env bash

EDP_CONNECTED=`xrandr | grep ' connected' | grep -oP 'eDP-1'`
if [ EDP_CONNECTED -eq "eDP-1" ]; then
	exit 0
fi


if [ "$1" -eq "1" ]; then
  logger "AC_CHANGE setting eDP-1 screen refresh rate to 120Hz"
  xrandr --output eDP-1 --mode "1920x1080" --refresh 120
  dbus-send --session --type=method_call --dest="org.gnome.SettingsDaemon.Power" /org/gnome/SettingsDaemon/Power org.freedesktop.DBus.Properties.Set string:"org.gnome.SettingsDaemon.Power.Screen" string:"Brightness" variant:int32:100
elif [ "$1" -eq "0" ]; then
  logger "AC_CHANGE setting eDP-1 screen refresh rate to 60Hz"
  CVT_MODELINE=`cvt -r 1920 1080 | grep -oP "\".*"`
  MODELINE_NAME=`echo ${CVT_MODELINE} | grep -o -P '(?<=\").*(?=\")'` > /dev/null
  xrandr --newmode ${CVT_MODELINE} > /dev/null 2>&1
  xrandr --addmode eDP-1 "${MODELINE_NAME}" > /dev/null 2>&1
  xrandr --display :1 --output eDP-1 --mode "${MODELINE_NAME}"
  dbus-send --session --type=method_call --dest="org.gnome.SettingsDaemon.Power" /org/gnome/SettingsDaemon/Power org.freedesktop.DBus.Properties.Set string:"org.gnome.SettingsDaemon.Power.Screen" string:"Brightness" variant:int32:33
fi
EOF
sudo chmod +x /usr/bin/ac_change.sh
sudo udevadm control --reload-rules
sudo udevadm trigger