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#!/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 level between restarts.
# Description: This script saves the brightness level between restarts.
# It is called from the boot, halt and reboot scripts.
### END INIT INFO
readonly SAVEFILE_PREFIX=/var/lib/initscripts/brightness
. /lib/init/vars.sh
. /lib/lsb/init-functions
do_invoke() {
local rv=0 rc
# ACPI (without explicit label)
do_$1 '' \
/sys/class/backlight/acpi_video0/brightness \
/sys/class/backlight/acpi_video0/max_brightness
rc=$?
test $rc -lt $rv || rv=$rc
# Intel
do_$1 intel \
/sys/class/backlight/intel_backlight/brightness \
/sys/class/backlight/intel_backlight/max_brightness
rc=$?
test $rc -lt $rv || rv=$rc
# could insert others using the same scheme here
return $rv
}
do_status() {
local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
test -e "$knob" || return 0
MSG="Current${label:+ $label} brightness level is $(cat "$knob")"
if test -f "$file"; then
log_success_msg "${MSG}, saved value is $(cat "$file")"
return 0
fi
log_failure_msg "${MSG}, there is no saved value"
return 4
}
do_start() {
local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
test -e "$knob" || return 0
test x"$VERBOSE" = x"no" || \
log_action_begin_msg Initialising $label brightness level
if test -f "$file"; then
cat "$file" >"$knob"
else
cat "$max" >"$knob"
fi
local rv=$?
test x"$VERBOSE" = x"no" || log_action_end_msg $rv
return $rv
}
do_stop() {
local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
test -e "$knob" || return 0
# If the backlight is off, don't save to avoid blank display after
# reboot. See Devuan #617.
test "$(cat $knob)" -eq 0 && return 0
test x"$VERBOSE" = x"no" || \
log_action_begin_msg Saving $label brightness level
cat "$knob" >"$file"
local rv=$?
test x"$VERBOSE" = x"no" || log_action_end_msg $rv
return $rv
}
case $1 in
(start|restart|reload|force-reload)
do_invoke start
;;
(stop)
do_invoke stop
;;
(status)
do_invoke status
;;
(*)
echo >&2 "Usage: $0 {start|stop|restart|reload|force-reload|status}"
exit 3
;;
esac
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