set_bright4

#!/usr/bin/env bash
# set_bright4

set -x


# Set these names according to what xrandr tells you.
# For a single monitor, comment out the second xrandr line at the bottom.

monitor_1="DVI-I-1"
monitor_2="VGA-1"



get_current_values () {
	
	current_bright=$(xrandr --verbose | grep -m1 Brightness | cut -d" " -f2)
	current_gamma=$(xrandr --verbose |grep -m1 Gamma | cut -d":" -f3)
	gamma1="$current_gamma"

}


select_values () {

	values=$(yad --form --field=Brightness:NUM 	--field=Gamma:NUM \
	 "${current_bright}\!0.20..1.20\!0.1\!2" \
	 "${current_gamma}\!0.5..1.5\!0.1\!1")
	 	exit_code="$?"
		if [[ $exit_code -eq 1 ]] ; then
			exit 0
		fi

	value1=$(echo "$values" | awk -F"|" '{ print $1 }')
	value2=$(echo "$values" | awk -F"|" '{ print $2 }')
	new_bright="${value1:0:4}"
	new_gamma="${value2:0:3}"

}


get_current_values
select_values

# Less bright setting for second monitor.
new_bright2="0$(echo $new_bright - 0.10 | bc)"

# For single monitor, comment out second xrandr command.
# For two monitors with same brightness, edit second xrandr command;
# change "$new_bright2" to "$new_bright"
xrandr --output "$monitor_1" --brightness "$new_bright" --gamma "${new_gamma}:${new_gamma}:${new_gamma}"
xrandr --output "$monitor_2" --brightness "$new_bright2" --gamma "${new_gamma}:${new_gamma}:${new_gamma}"

exit 0