#!/bin/sh
# Anything related to powersaving

WLANPATH=/sys/bus/pci/drivers/iwl3945/0000:03:00.0/power_level
INTF_WOL=(eth0) # List of interfaces separated by whitespace
HAL_POLLING=(scd0) # Disable device polling
case "$1" in
	true)
		# Wireless power saving; sacrifice performance slightly
		if [ -e $WLANPATH ] ; then
			echo 1 > ${WLANPATH} &
		fi
		# Disable WOL for a MagicPacket(tm)
		for i in ${INTF_WOL[*]};
		do
			ethtool -s $i wol d
		done
		# Enable USB autosuspend for all active USB devices
		for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 1 > $i; done &
		# Disable HAL device polling
		for i in ${HAL_POLLING[*]};
		do
			hal-disable-polling --device /dev/${i}
		done
		# Enable CPU powersaving
		echo 1 > /sys/devices/system/cpu/sched_mc_power_savings &
		echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor &
		# Enable "laptop mode"
		echo 5 > /proc/sys/vm/laptop_mode &
		# Modify VM dirty writeback time 5/15 seconds
		echo 1500 > /proc/sys/vm/dirty_writeback_centisecs &
		;;
	false)
		# Disable wireless power saving
		if [ -e $WLANPATH ] ; then
			echo 0 > ${WLANPATH} &
		fi
		# Enable WOL for a MagicPacket(tm)
		for i in ${INTF_WOL[*]};
		do
			ethtool -s $i wol g
		done
		# Enable HAL device polling
		for i in ${HAL_POLLING[*]};
		do
			hal-disable-polling --enable-polling --device /dev/${i}
		done
		# Disable USB autosuspend for all active USB devices
		for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 0 > $i; done &
		# Disable CPU powersaving
		echo 0 > /sys/devices/system/cpu/sched_mc_power_savings &
		echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor &
		# Disable "laptop mode"
		echo 0 > /proc/sys/vm/laptop_mode &
		# Modify VM dirty writeback time 5/15 seconds
		echo 500 > /proc/sys/vm/dirty_writeback_centisecs &
		;;
esac