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#!/bin/bash
# A simple script to control screen brightness using 'notify send'
# copyright Srikant Patnaik
# GNU GPLv3
# Three brightness modes
brightness_max=250
brightness_med=160
brightness_low=80
# A file to store previous brightness value
status_file=/tmp/previous_brightness
# If running for first time, then create the status file with med value for brightness
if [ ! -f $status_file ];
then
echo $brightness_med > $status_file
fi
previous_brightness=$(cat $status_file)
if (( "$previous_brightness" == "80" ));
then
echo $brightness_med > /sys/class/backlight/pwm-backlight.0/brightness
#notify-send "medium brightness"
echo -n "medium brightness" | osd_cat --font='-b&h-lucida-medium-r-normal-*-34-*-*-*-p-*-iso10646-1' --color=green --pos=top --align=right --offset=50 --indent=50 -d 1
echo $brightness_med > $status_file
elif (( "$previous_brightness" == "160" ));
then
echo $brightness_max > /sys/class/backlight/pwm-backlight.0/brightness
#notify-send "full brightness"
echo -n "full brightness" | osd_cat --font='-b&h-lucida-medium-r-normal-*-34-*-*-*-p-*-iso10646-1' --color=green --pos=top --align=right --offset=50 --indent=50 -d 1
echo $brightness_max > $status_file
else
echo $brightness_low > /sys/class/backlight/pwm-backlight.0/brightness
# notify-send "low brightness"
echo -n "low brightness" | osd_cat --font='-b&h-lucida-medium-r-normal-*-34-*-*-*-p-*-iso10646-1' --color=green --pos=top --align=right --offset=50 --indent=50 -d 1
echo $brightness_low > $status_file
fi
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