#!/bin/bash

#
# Control script for ACPI lid state and AC adapter state
#

getXuser() {
	# AWK is better than grep since it split the line in fields
        user=$(who| awk "\$2 == \":$displaynum\" {print \$1; exit}")
        if [ x"$user" != x"" ]; then
                userhome=$(getent passwd $user | cut -d: -f6)
                export XAUTHORITY=$userhome/.Xauthority
        else
                export XAUTHORITY=""
        fi
}

aticonfig='/opt/ati/bin/aticonfig'

grep -q closed /proc/acpi/button/lid/*/state
if [ $? = 0 ]; then
 lid_closed=1
else
 lid_closed=0
fi

grep -q off-line /proc/acpi/ac_adapter/*/state 
if [ $? = 0 ]; then
   on_dc=1
else
   on_dc=0
fi

# We build a list of all the active displays
displays=$(ls /tmp/.X11-unix/* | sed s#/tmp/.X11-unix/X##)

if [ ${lid_closed} -eq 1 -o ${on_dc} -eq 1 ]; then
    logger "ATI: Entering low power mode..."
    for x in $displays; do
	getXuser;
	if [ x"$XAUTHORITY" != x"" ]; then
	    export DISPLAY=":$displaynum"
            low_voltage_state=$(su $user -c "$aticonfig --lsp | grep 'low voltage' | cut -c 3")
	    su $user -c "$aticonfig --set-powerstate=$low_voltage_state"
	fi
    done
else
    echo "ATI: Entering high power mode..."
    for x in $displays; do
	getXuser;
	if [ x"$XAUTHORITY" != x"" ]; then
	    export DISPLAY=":$displaynum"
            performance_state=$(su $user -c "$aticonfig --lsp | grep 'performance mode' | cut -c 3")
	    su $user -c "$aticonfig --set-powerstate=$performance_state"
	fi
    done
fi