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#! /bin/bash
#----------------------------------------------------------------------
# Description: Put CPU to and backto full powersave mode
# Author: Artem S. Tashkinov <birdie at permonline.ru>
# Created at: Sun Jun 19 00:14:40 YEKST 2005
# Computer: home.birdie.net
# System: Linux 2.6.12-k8 on i686
#
# Thu Jul 1 19:18:10 2010
# 1.0 Added SMP support
# Sun Dec 25 16:50:36 2011
# 1.1 Completely reworked modules loading mechanism
# userspace governor
# Sun Jul 22 05:30:16 YEKT 2012
# 1.2 Set/Reset
# Improved output
#
# Copyright (c) 2005-2012 Artem S. Tashkinov. All rights reserved.
#----------------------------------------------------------------------
version=1.1
DRIVER=acpi_cpufreq
cpu0=/sys/devices/system/cpu/cpu0/cpufreq
max0=$cpu0/cpuinfo_max_freq
lim0=$cpu0/scaling_max_freq
SD=$cpu0/scaling_driver
if [ ! -f $SD -a "$1" != "-l" -a "$1" != "--load" ]; then
echo "Error: cpufrequency subsystem is not running!"
exit 1
fi
SG=/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
governors=`cat $cpu0/scaling_available_governors 2>&1`
for i in performance conservative userspace powersave ondemand; do
cgovern=`echo $governors | grep $i`
if [ -z "$cgovern" ]; then
echo "CPU governor '$i' not found."
module="cpufreq_$i"
echo "Installing $module ... "
modprobe $module >/dev/null 2>&1
if [ "$?" != "0" ]; then
echo "Error: can't load $module module. Do you have it installed?"
exit 1
else
echo "OK"
fi
fi
done
test "$1" = "-l" -o "$1" = "--load" || current=`cat $SG`
case $1 in
--version|-v) #print the version number
echo "`basename $0` version "$version
exit 0;;
--help|-h) #Display the help screen
echo "Usage: `basename $0` [OPTION]"
echo " -M --maximum - performance mode (minimum powersavings)"
echo " -m --mimimum - powersave mode (minimum performance)"
echo " -a --auto - ondemand mode (rapid auto performance)"
echo " -c --conservative - conservative mode (gradual auto performance)"
echo " -u --userspace FREQ - user defined CPU frequency"
echo " -l --load - load CPU powersave driver"
echo " -n --now - show current mode"
echo " -s --set FREQ - set maximum CPU frequency"
echo " -r --reset - reset maximum CPU frequency"
echo " -v --version - show application version and exit"
echo " -h --help - show this help and exit"
exit 0;;
--load|-l)
KDRIVER=`echo $DRIVER | sed 's/-/_/g'`
if [ -z "`lsmod | grep $KDRIVER`" ]; then
modprobe $DRIVER && echo "CPU powersave driver has been loaded successfully"
else
echo "CPU powersave driver is already loaded"
fi
exit;;
--userspace|-u)
allowed=`cat $cpu0/scaling_available_frequencies`
if [ -z "$2" ]; then
echo "Need an argument to continue. The possible frequences are: "
echo $allowed
else
if [ -n "`echo "$allowed" | grep -w "$2"`" ]; then
echo -n "Setting "$2" frequency ... "
echo "userspace" | tee $SG > /dev/null
echo "$2" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed > /dev/null
[ "`cat $cpu0/scaling_cur_freq 2>/dev/null`" == "$2" ] && echo OK || echo Failed
else
echo "'$2' is not amongst allowed frequencies: "
echo $allowed
fi
fi
exit;;
--conservative|-c)
echo "conservative" | tee $SG > /dev/null
echo "conservative mode has been activated"
exit;;
--minimum|-m)
echo "powersave" | tee $SG > /dev/null
echo "powersave mode has been activated"
exit;;
--maximum|-M)
echo "performance" | tee $SG > /dev/null
echo "performance mode has been activated"
exit;;
--set|-s)
allowed=`cat $cpu0/scaling_available_frequencies`
if [ -z "$2" ]; then
echo "Need an argument to continue. The possible frequences are: "
echo $allowed
else
if [ -n "`echo "$allowed" | grep -w "$2"`" ]; then
echo "The current governor is: `cat $cpu0/scaling_governor`"
echo "Setting maximum frequency ... "
echo "$2" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq > /dev/null
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
else
echo "'$2' is not amongst allowed frequencies: "
echo $allowed
fi
fi
exit;;
--reset|-r)
echo "The current governor is: `cat $cpu0/scaling_governor`"
echo "Resetting maximum frequency ... "
cat $max0 | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq > /dev/null
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
exit;;
--auto|-a)
echo "ondemand" | tee $SG > /dev/null
echo "auto (ondemand) mode has been activated"
exit;;
--now|-n|*)
cmode=`cat $SG | sort | uniq`
echo "$cmode mode is currently activated:"
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
if [ "`cat $max0`" == "`cat $lim0`" ]; then
echo "No frequency limit is enforced."
else
echo "Maximum allowed frequency is `cat $lim0` (out of `cat $max0`)"
fi
exit;;
esac
