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#!/bin/bash
current=`xbacklight -get`
# alternatively, if xbacklight does not work:
# current=`qdbus org.gnome.SettingsDaemon.Power /org/gnome/SettingsDaemon/Power org.gnome.SettingsDaemon.Power.Screen.GetPercentage`
scale="1 2 5 10 20 50 100"
case $1 in
"down")
# translate space to newline so tac will reverse order of lines (values)
for val in $(tr ' ' '\n' <<< $scale | tac) ; do
# scale = 3 to preserve some decimal values
if (( $(bc <<< "scale=3 ; $val < $current/1.1") )) ; then
newval=$val
break
fi
done
;;
"up")
for val in $scale ; do
# scale = 3 to preserve some decimal values
if (( $(bc <<< "scale=3 ; $val > $current*1.1") )) ; then
newval=$val
break
fi
done
;;
*)
echo "Usage: $0 [up, down]"
exit 1
esac
if [ "x$newval" == "x" ] ; then
echo "Already at min/max."
else
echo "Setting backlight to $newval."
# thanks: https://bbs.archlinux.org/viewtopic.php?pid=981217#p981217
notify-send " " -i notification-display-brightness-low -h int:value:$newval -h string:x-canonical-private-synchronous:brightness &
xbacklight -set $newval -steps 1 -time 0
# alternatively, if xbacklight does not work:
# qdbus org.gnome.SettingsDaemon.Power /org/gnome/SettingsDaemon/Power org.gnome.SettingsDaemon.Power.Screen.SetPercentage $newval
fi
exit 0