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#!/bin/bash
#
# nvidiablctl v0.2
#
# Copyright (c) 2011, Piotr Karbowski <piotr.karbowski@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are
# permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this
# list of conditions and the following disclaimer in the documentation and/or other
# materials provided with the distribution.
# * Neither the name of the Piotr Karbowski nor the names of its contributors may be
# used to endorse or promote products derived from this software without specific
# prior written permission.
backlights_path='/sys/class/backlight/nvidia_backlight'
max_brightness="$(< ${backlights_path}/max_brightness)"
current_brightness="$(< ${backlights_path}/actual_brightness)"
adjust_brightness() {
if [ "$1" -gt "${max_brightness}" ]; then
new_value="${max_brightness}"
elif [ "$1" -lt '0' ]; then
new_value="0"
else
new_value="$1"
fi
echo "${new_value}" > "${backlights_path}/brightness"
}
printhelp() {
name="${0##*/}"
echo " * ${name} v0.1
${name} up
brightness +10
${name} down
brightness -10
${name} full
full brightness
${name} off
turn off screen (brightness 0)
${name} set <n>
set brightness to <n>
"
}
case "$1" in
up)
adjust_brightness "$((${current_brightness}+10))"
;;
down)
adjust_brightness "$((${current_brightness}-10))"
;;
off)
adjust_brightness '0'
;;
full)
adjust_brightness "${max_brightness}"
;;
set)
if [ -n "$2" ] && [[ "$2" =~ ^[0-9]+$ ]]; then
adjust_brightness "$2"
else
echo "set need numeric second argument."; exit 1
fi
;;
*)
printhelp; exit 1
;;
esac
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