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#!/bin/bash | |
# Copyright (c) 2011, Michel Alexandre Salim <salimma@fedoraproject.org> | |
# Permission is hereby granted, without written agreement and without | |
# license or royalty fees, to use, copy, modify, and distribute this | |
# software and its documentation for any purpose, provided that the | |
# above copyright notice and the following two paragraphs appear in | |
# all copies of this software. | |
# | |
# IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
# ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
# IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
# DAMAGE. | |
# | |
# THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
# FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
# ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
# PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
BACKLIGHT_DIR=/sys/class/backlight | |
ACPI=${BACKLIGHT_DIR}/acpi_video0 | |
INTEL=${BACKLIGHT_DIR}/intel_backlight | |
ACPI_MAX=`cat ${ACPI}/max_brightness` | |
INTEL_MAX=`cat ${INTEL}/max_brightness` | |
# this is about 500 | |
#MULTIPLIER=$((INTEL_MAX/(ACPI_MAX+1))) | |
MULTIPLIER=500 | |
MIN_BRIGHTNESS=$((INTEL_MAX-(MULTIPLIER*ACPI_MAX))) | |
function fib { | |
let a=$1 | |
let b=$2 | |
let n=$3 | |
if [ $n == 0 ]; then | |
INTEL_BRIGHTNESS=$a | |
else | |
fib $b $((a + b)) $((n-1)) | |
fi | |
} | |
while inotifywait -e modify ${ACPI}/brightness >/dev/null 2>&1; do | |
BRIGHTNESS=`cat ${ACPI}/brightness` | |
# specially handle maximum value | |
if [ ${BRIGHTNESS} == ${ACPI_MAX} ]; then | |
INTEL_BRIGHTNESS=$INTEL_MAX | |
else | |
# arithmetic | |
INTEL_BRIGHTNESS=$((MULTIPLIER*(BRIGHTNESS+1))) | |
# geometric | |
#INTEL_BRIGHTNESS=$((INTEL_MAX >> (8-BRIGHTNESS))) | |
#INTEL_BRIGHTNESS=$((25 << BRIGHTNESS)) | |
#fibonacci | |
#fib 100 200 $(BRIGHTNESS) | |
fi | |
echo ${INTEL_BRIGHTNESS} > ${INTEL}/brightness | |
done |
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