ACPI action script for battery events

This is an example ACPI action script that makes Power Management adjustments according to if you are on battery or on AC. Usually this is saved as /etc/acpid/actions/battery.sh.

#!/bin/sh
# Tried on Gentoo
# cpu throttling is in here it is the cpufreq-set lines
# turning swap off is only for those that feel comfortable
# doing something this nasty.
# comment out the laptop_mode line if you don't have it installed
# pcfe, 2008-10-28
                                                                                                                                   
                                                                                                                                   
# spindown time for HD (man hdparm for valid values)
# I prefer 2 hours for acad and 2 min for batt
ACAD_HD=244
BATT_HD=24
                                                                                                                                   
# Power management level
# 255 (off) on AC
# 128 (medium) on batt
# lowered to 32, pcfe, 2004-06-23
# upped to 64, pcfe, 2004-07-14
# upped to 96, pcfe, 2004-10-20
ACAD_PM=255
BATT_PM=96
                                                                                                                                   
# ac/battery event handler
                                                                                                                                   
status=`awk '/^state: / { print $2 }' /proc/acpi/ac_adapter/AC/state`
                                                                                                                                    
if [ "$status" = "off-line" ]
then
              logger "Running /sbin/laptop_mode start"
              /sbin/laptop_mode start
              logger "Setting HD spindown for BATT mode with hdparm -S $ACAD_HD /dev/hda."
              /sbin/hdparm -S $BATT_HD /dev/hda > /dev/null 2>&1
              logger "Setting HD powersaving for BATT mode with hdparm -B $ACAD_PM /dev/hda."
              /sbin/hdparm -B $BATT_PM /dev/hda > /dev/null 2>&1
              logger "Turning off swap."
              /sbin/swapoff -a
	       /usr/bin/cpufreq-set -g conservative         
else   
              logger "Turning on swap."
              /sbin/swapon -a
              logger "Running /sbin/laptop_mode start"
              /sbin/laptop_mode stop
              logger "Setting HD spindown for AC mode with hdparm -S $BATT_HD /dev/hda."
              /sbin/hdparm -S $ACAD_HD /dev/hda > /dev/null 2>&1
              logger "Setting HD powersaving for AC mode with hdparm -B $BATT_PM /dev/hda."
              /sbin/hdparm -B $ACAD_PM /dev/hda > /dev/null 2>&1
              /usr/bin/cpufreq-set -g ondemand
fi