/usr/bin/mirbacklight is in mir-utils 0.31.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | #!/bin/sh
#
# Copyright © 2015 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author: Daniel van Vugt <daniel.van.vugt@canonical.com>
#
if [ -z "$1" ] ; then
percent=100
else
percent=$1
fi
for devdir in /sys/class/backlight/* /sys/class/leds/lcd-backlight ; do
if [ -d "$devdir" ] ; then
max=`cat $devdir/max_brightness`
val=$(($max * $percent / 100))
echo $val > $devdir/brightness
echo "Set backlight $devdir to $percent% ($val/$max)"
fi
done
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