Hi,
I wrote a simple init script to save and restore backlight brightness between
reboots (have taken urandom as base idea).
If some one wants to try it:
- save the attached script in /etc/init.d and make it executable
- create the wanted sym link in /etc/rc*.d (I suggest rcS.d/S55brightness
rc0.d/S30brightness rc6.d/S30brightness)
- create the directory /var/lib/backlight where brightenss value will be saved
all this as root naturally.
My two cents ...
Marco
#! /bin/sh
### BEGIN INIT INFO
# Provides: brightness
# Required-Start: $local_fs
# Required-Stop: $local_fs
# Default-Start: S
# Default-Stop: 0 6
# Short-Description: Save and restore brightness between restarts.
# Description: This script saves the brightness between restarts.
# It is called from the boot, halt and reboot scripts.
### END INIT INFO
[ -c /dev/urandom ] || exit 0
PATH=/sbin:/bin
SAVEDFILE=/var/lib/backlight/brightness
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_status () {
if [ -f $SAVEDFILE ] ; then
return 0
else
return 4
fi
}
case "$1" in
start|"")
[ "$VERBOSE" = no ] || log_action_begin_msg "Restoring backlight
brightness"
cat "$SAVEDFILE" >/sys/class/backlight/pwm-backlight/brightness 2>&1
ES=$?
[ "$VERBOSE" = no ] || log_action_end_msg $ES
;;
stop)
# Carry a brightness from shut-down to start-up;
[ "$VERBOSE" = no ] || log_action_begin_msg "Saving backlight
brightness"
cat /sys/class/backlight/pwm-backlight/brightness > "$SAVEDFILE" 2>&1
ES=$?
[ "$VERBOSE" = no ] || log_action_end_msg $ES
;;
status)
do_status
exit $?
;;
restart|reload|force-reload)
echo "Error: argument '$1' not supported" >&2
exit 3
;;
*)
echo "Usage: brightness start|stop" >&2
exit 3
;;
esac
:
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