A script to boost peformance of ASUS Eee PC 901 by using Super Hybrid Engine and GMABooster techniques

booster.sh

#!/bin/sh

function doc {
	# The formatting here is weird but an output is correct
	cat << EOF
This script can be used to display current Super Hybrid Engine CPU mode
for ASUS Eee PC netbooks and frequency of GMA950 video chip as well as
change them. This version of the script is written specifically for
ASUS Eee PC 901.

This script must be run as root since only one function (getting CPU
mode) can normally be performed as unpriviledged user and it's easier
to perform the check only once.

Usage:

${0}			Display current CPU mode and GPU frequency
${0} cpu		Display current CPU mode
${0} cpu MODE		Change CPU mode to MODE. Available modes:
				powersave, normal, performance
${0} gpu		Display current GPU frequency
${0} gpu FREQ		Change GPU frequency to FREQ. Available
				frequencies: 200, 250, 400
${0} powersave		Shorthand for 'cpu powersave' and 'gpu 200'
${0} normal		Shorthand for 'cpu normal' and 'gpu 250';
				note that default GPU frequency is actually
				200 MHz, but 250 MHz provides good balance
${0} performance	Shorthand for 'cpu performance' and
				'gpu 400'
EOF
}

function usage {
	cat << EOF
${0} [cpu [powersave|normal|performance]]
${0} [gpu [200|250|400]]
${0} [powersave|normal|performance]
${0} help
EOF
}

function check_root {
	if [ ${UID} -ne 0 ]; then
		echo "This script must be run as root." >&2
		exit 1
	fi
}

function get_cpu_mode {
	CURRENT_VALUE=$(</sys/devices/platform/eeepc/cpufv)
	case "${CURRENT_VALUE}" in
		0x302) echo "powersave" ;;
		0x301) echo "normal" ;;
		0x300) echo "performance" ;;
		*)
			echo "Can't decipher VGA bus speed." >&2
			exit 1
		;;
	esac
}

function set_cpu_mode {
	case "${1}" in
		powersave) VALUE="2" ;;
		normal) VALUE="1" ;;
		performance) VALUE="0" ;;
		*)
			echo "Illegal argument! Possible values are: powersave, normal, performance."  >&2
			exit 1
		;;
	esac
	echo ${VALUE} > /sys/devices/platform/eeepc/cpufv
	echo "CPU mode is set to ${1}"
}	

function get_gpu_frequency {
	CURRENT_VALUE=$(/sbin/setpci -s 02.0 f0.b)
	case "${CURRENT_VALUE}" in
		00) echo "200 MHz" ;;
		01) echo "250 MHz" ;;
		03) echo "400 MHz" ;;
		*)
			echo "Can't decipher VGA bus speed." >&2
			exit 1
		;;
	esac
}

function set_gpu_frequency {
	case "${1}" in
		200) VALUE=34 ;;
		250) VALUE=31 ;;
		400) VALUE=33 ;;
		*)
			echo "Illegal argument! Possible values are: 200, 250, 400."  >&2
			exit 1
		;;
	esac
	/sbin/setpci -s 02.0 f0.b=00,60
	/sbin/setpci -s 02.0 f0.b=${VALUE},05
	echo "GPU frequency is set to ${1} MHz"
}

# Only get_cpu_mode() works as a regular user, so just demand root for everyting
check_root

case ${1} in
	cpu)
		if [ -z ${2} ]; then
			get_cpu_mode
		else
			set_cpu_mode ${2}
		fi
	;;
	gpu)
		if [ -z ${2} ]; then
			get_gpu_frequency
		else
			set_gpu_frequency ${2}
		fi
	;;
	powersave)
		set_cpu_mode powersave
		set_gpu_frequency 200
	;;
	normal)
		set_cpu_mode normal
		set_gpu_frequency 250
	;;
	performance)
		set_cpu_mode performance
		set_gpu_frequency 400
	;;
	"")
		echo "CPU mode is: $(get_cpu_mode)"
		echo "GPU frequency is: $(get_gpu_frequency)"
	;;
	help) doc ;;
	*) usage ;;
esac