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#!/bin/bash
echoerr() {
>&2 echo "$@"
}
max=$(intel_reg read 0xC8254 2>/dev/null | awk '{print $3}')
max=${max:2:4}
max_dec=$(printf "%d" $((16#$max)))
cur_br=$(cat /sys/class/backlight/intel_backlight/brightness)
cur_per=$(($cur_br * 100 / $max_dec))
case "$1" in
"+")
new_per=$(($cur_per+10))
;;
"-")
new_per=$(($cur_per-10))
;;
*)
echoerr "command '$1' not supported"
exit 1
;;
esac
if [ $new_per -lt 0 ]; then
new_per=0
elif [ $new_per -gt 100 ]; then
new_per=100
fi
new_val=$(($new_per * $max_dec / 100))
echo $new_val > /sys/class/backlight/intel_backlight/brightness
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