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Forum index » Advanced Topics » Cutting edge

backlight settings cl script
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Karl Godt

Joined: 20 Jun 2010
Posts: 2675
Location: Kiel,Germany

Posted: Fri 01 Jun 2012, 15:58 Post subject:

backlight settings cl script
Subject description: netbook was having "0" in daylight

Good day !

Today i booted my netbook to find having set a zero in

" /sys/class/backlight/acpi_video0/brightness " .

I remember iguleder had a small c binary in his squeeze dpup times nearly two years ago , but that had not been accessible for me today .

So i hug a script called " set_bl " -- if anyone discovers bugs or different paths or max values, please let me know :

Code:

#!/bin/sh
# Wriiten by Karl Reimer Godt
# Applies the usual "Puppy License"
Version='1.0 Puppy-Linux-Racy_5.3 KRG'

bckl_dir=`echo -e /sys/class/backlight/*/`
curr_file=/sys/class/backlight/*/actual_brightness
set_file=/sys/class/backlight/*/brightness
max_file=/sys/class/backlight/*/max_brightness
uevent_file=/sys/class/backlight/*/uevent

usage(){
MSG="
$0 [list|info|help|version] [ # [FILENAME]]

Script to set the display brightness for Laptops.
Defaultfilename : /sys/class/backlight/*/brightness

"
if [ "$2" ];then
MSG="$MSG

$2"
fi
echo "$MSG"
[ "$DISPLAY" ] && xmessage -bg blue3 "$MSG"
exit $1
}

case $1 in
help) usage 0;;
version) echo -e "\n$0: Version '$Version'\nTry help for more info\n"
exit 0;;
list) if find /sys -name "backlight" ;then :
else echo "No backlight support detected. Did the driver load?"
exit 1;fi
ls -1 /sys/class/backlight/*/
exit $?
;;
info)

echo "GENERAL INFO:"
ls -l $uevent_file |rev|sed 's- -\n-'|rev
CONT=`cat $uevent_file`
[ "$CONT" ] || CONT='No entry.'
echo "$CONT"
echo

echo "CURRENT:"
ls -l $curr_file |rev|sed 's- -\n-'|rev
CONT=`cat $curr_file`
[ "$CONT" ] || CONT='No entry.'
echo "CUR_SET='$CONT'"

echo

echo "SET AS:"
ls -l $set_file |rev|sed 's- -\n-'|rev
CONT=`cat $set_file`
[ "$CONT" ] || CONT='No entry.'
echo "_SET='$CONT'"

echo

echo "MAXIMUM to be SET TO:"
ls -l $max_file |rev|sed 's- -\n-'|rev
CONT=`cat $max_file`
[ "$CONT" ] || CONT='No entry.'
echo "MAX_SET='$CONT'"

;;

[0-9]*)
VAL=$1

if [ "$2" ];then
[ -e "$2" ] || usage 1 "'$2' does not exist."
[ -d "$2" ] && usage 1 "Is a directory."
[ -f "$2" ] || usage 1 "Not a regular file."
echo $VAL > "$2"
exit $?;fi

if find $bckl_dir -name "brightness";then
echo $VAL > $bckl_dir/brightness
else
usage 1 "Not Found."
fi
exit $?
;;
"") usage 1 "Need Parameter.";;
*) usage 1 "Unknown Parameter.";;
esac

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