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# Copyright © 2015 Canonical Ltd.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3 as
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# published by the Free Software Foundation.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Author: Daniel van Vugt <daniel.van.vugt@canonical.com>
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for devdir in /sys/class/backlight/* /sys/class/leds/lcd-backlight ; do
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if [ -d "$devdir" ] ; then
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max=`cat $devdir/max_brightness`
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val=$(($max * $percent / 100))
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echo $val > $devdir/brightness
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echo "Set backlight $devdir to $percent% ($val/$max)"