93 lines
2.1 KiB
Plaintext
93 lines
2.1 KiB
Plaintext
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#!/bin/sh
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### BEGIN INIT INFO
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# Provides: brightness
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# Required-Start: $local_fs
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# Required-Stop: $local_fs
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# Default-Start: S
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# Default-Stop: 0 6
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# Short-Description: Save and restore brightness level between restarts.
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# Description: This script saves the brightness level between restarts.
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# It is called from the boot, halt and reboot scripts.
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### END INIT INFO
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readonly SAVEFILE_PREFIX=/var/lib/initscripts/brightness
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. /lib/init/vars.sh
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. /lib/lsb/init-functions
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do_invoke() {
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local rv=0 rc
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# ACPI (without explicit label)
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do_$1 '' \
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/sys/class/backlight/acpi_video0/brightness \
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/sys/class/backlight/acpi_video0/max_brightness
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rc=$?
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test $rc -lt $rv || rv=$rc
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# Intel
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do_$1 intel \
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/sys/class/backlight/intel_backlight/brightness \
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/sys/class/backlight/intel_backlight/max_brightness
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rc=$?
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test $rc -lt $rv || rv=$rc
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# could insert others using the same scheme here
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return $rv
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}
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do_status() {
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local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
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test -e "$knob" || return 0
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MSG="Current${label:+ $label} brightness level is $(cat "$knob")"
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if test -f "$file"; then
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log_success_msg "${MSG}, saved value is $(cat "$file")"
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return 0
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fi
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log_failure_msg "${MSG}, there is no saved value"
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return 4
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}
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do_start() {
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local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
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test -e "$knob" || return 0
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test x"$VERBOSE" = x"no" || \
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log_action_begin_msg Initialising $label brightness level
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if test -f "$file"; then
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cat "$file" >"$knob"
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else
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cat "$max" >"$knob"
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fi
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local rv=$?
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test x"$VERBOSE" = x"no" || log_action_end_msg $rv
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return $rv
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}
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do_stop() {
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local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
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test -e "$knob" || return 0
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test x"$VERBOSE" = x"no" || \
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log_action_begin_msg Saving $label brightness level
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cat "$knob" >"$file"
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local rv=$?
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test x"$VERBOSE" = x"no" || log_action_end_msg $rv
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return $rv
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}
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case $1 in
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(start|restart|reload|force-reload)
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do_invoke start
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;;
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(stop)
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do_invoke stop
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;;
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(status)
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do_invoke status
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;;
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(*)
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echo >&2 "Usage: $0 {start|stop|restart|reload|force-reload|status}"
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exit 3
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;;
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esac
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