1#!/bin/sh
2
3update_brightness()
4(
5	BRIGHTNESS=$(( `sysctl -n dev.isl.0.als` ))
6	if [ $BRIGHTNESS -lt 15 ]; then
7		BRIGHTNESS=15
8	fi
9	if [ $BRIGHTNESS -gt 100 ]; then
10		BRIGHTNESS=100
11	fi
12	return $BRIGHTNESS
13)
14
15update_brightness
16LAST=$?
17intel_backlight $LAST >/dev/null
18
19while sleep 1; do
20	update_brightness
21	NEW=$?
22	if [ $LAST -gt $NEW ]; then
23		DIFF=$(( $LAST - $NEW ))
24		if [ $DIFF -gt 4 ]; then
25			while [ $LAST -gt $NEW ]; do
26				LAST=$(( LAST - 2 ))
27				intel_backlight $LAST >/dev/null
28				sleep 0.01
29			done
30		fi
31	else
32		DIFF=$(( $NEW - $LAST ))
33		if [ $DIFF -gt 4 ]; then
34			while [ $LAST -lt $NEW ]; do
35				LAST=$(( LAST + 2 ))
36				intel_backlight $LAST >/dev/null
37				sleep 0.01
38			done
39		fi
40	fi
41done
42