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#!/bin/bash
#
# Brightness script for the ASUS G74SX
#
# Arguments:
# up - increase brightness by 1
# down - decrease brightness by 1
#
BRIGHTNESS=`cat /sys/devices/platform/asus-nb-wmi/leds/asus\:\:kbd_backlight/brightness`
MAX_BRIGHT=`cat /sys/devices/platform/asus-nb-wmi/leds/asus\:\:kbd_backlight/max_brightness`
# Try to recover brightness setting (since the `cat` seems to always return 0)
if [ -f /tmp/keyboard-brightness-ctl ]
then
BRIGHTNESS=`cat /tmp/keyboard-brightness-ctl`
fi
case "$1" in
up)
BRIGHTNESS=$((BRIGHTNESS + 1))
if [ $BRIGHTNESS -gt $MAX_BRIGHT ] ; then BRIGHTNESS=$MAX_BRIGHT ; fi
echo $BRIGHTNESS > /tmp/keyboard-brightness-ctl
echo $BRIGHTNESS > /sys/devices/platform/asus-nb-wmi/leds/asus\:\:kbd_backlight/brightness
;;
down)
BRIGHTNESS=$((BRIGHTNESS - 1))
if [ $BRIGHTNESS -lt 0 ] ; then BRIGHTNESS=0 ; fi
echo $BRIGHTNESS > /tmp/keyboard-brightness-ctl
echo $BRIGHTNESS > /sys/devices/platform/asus-nb-wmi/leds/asus\:\:kbd_backlight/brightness
;;
esac
@junf
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junf commented Nov 3, 2013

This is also valid for ASUS G75VW.

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