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#!/bin/bash
# Example notifier script -- lowers screen brightness, then waits to be killed
# and restores previous brightness on exit.
## CONFIGURATION ##############################################################
# Brightness will be lowered to this value.
min_brightness=0
# If your video driver works with xbacklight, set -time and -steps for fading
# to $min_brightness here. Setting steps to 1 disables fading.
fade_time=200
fade_steps=20
# If you have a driver without RandR backlight property (e.g. radeon), set this
# to use the sysfs interface and create a .conf file in /etc/tmpfiles.d/
# containing the following line to make the sysfs file writable for group
# "users":
#
# m /sys/class/backlight/acpi_video0/brightness 0664 root users - -
#
#sysfs_path=/sys/class/backlight/acpi_video0/brightness
# Time to sleep (in seconds) between increments when using sysfs. If unset or
# empty, fading is disabled.
fade_step_time=0.05
###############################################################################
get_brightness() {
if [[ -z $sysfs_path ]]; then
xbacklight -get
else
cat $sysfs_path
fi
}
set_brightness() {
if [[ -z $sysfs_path ]]; then
xbacklight -steps 1 -set $1
else
echo $1 > $sysfs_path
fi
}
fade_brightness() {
if [[ -z $sysfs_path ]]; then
xbacklight -time $fade_time -steps $fade_steps -set $1
elif [[ -z $fade_step_time ]]; then
set_brightness $1
else
local level
for level in $(eval echo {$(get_brightness)..$1}); do
set_brightness $level
sleep $fade_step_time
done
fi
}
trap 'exit 0' TERM INT
trap "set_brightness $(get_brightness); kill %%" EXIT
fade_brightness $min_brightness
sleep 2147483647 &
wait
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