# echo mem > /sys/power/state

# cat /proc/acpi/wakeup
# echo " LID" > /proc/acpi/wakeup

# apt-get install acpid
$ acpi_listen

# evtest
3 -> LCD open/close
4 -> power button

# vi /etc/acpi/events/lid
event=button[ /]lid                                                                                              
action=/etc/acpi/actions/lid_handler.sh %e

# chmod u+x /etc/acpi/events/lid

# vi /etc/acpi/actions/lid_handler.sh

#!/bin/sh                                                                                                        
# check if the lid is open or closed, using the /proc file
if grep closed /proc/acpi/button/lid/LID/state >/dev/null ; then
    # if the lid is now closed, save the network state and suspend to RAM
    /usr/share/wicd/daemon/suspend.py
    pm-suspend
else
    # if the lid is now open, restore the network state.
    # (if we are running, a wakeup has already occured!)
    /usr/share/wicd/daemon/autoconnect.py
fi

# chmod u+x /etc/acpi/actions/lid_handler.sh

# vi /etc/acpi/events/battery

event=battery.*                                                                                              
action=/etc/acpi/actions/low_battery_warning.sh %e

# chmod u+x /etc/acpi/events/battery

# vi /etc/acpi/actions/low_battery_warning.sh

#!/bin/sh
# Location of acpi files.
path="/sys/class/power_supply/BAT1"

# full=`cat $path/info|grep 'last full capacity'|awk -F: '{print $2}'|awk -Fm '{print $1}'`
# current=`cat $path/state|grep 'remaining capacity'|awk -F: '{print $2}'|awk -Fm '{print $1}'`
# state=$(( current * 100 / $full))
capacity=`cat $path/capacity`

# export XAUTHORITY=/home/yan/.Xauthority
export DISPLAY=:0 # This is needed so that the script can post to the display (using the zenity command, running through su as steph).

if [[ $capacity -lt 21 ]]
then
    # zenity --warning --title "Battery" --text "Low battery. (state = $state)"
    su yan -c "notify-send -u critical 'Low battery.'"
fi

# chmod u+x /etc/acpi/actions/low_battery_warning.sh