Laptop power saving - for a Lenovo X201s running Ubuntu 11.04

power

#!/bin/bash

rfkill block bluetooth
iwconfig wlan0 power on
iwconfig wlan0 txpower 30mW
iwconfig wlan0 power timeout 500ms
killall dropbox

echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 1 > /sys/module/snd_hda_intel/parameters/power_save


if [[ $1 == "max" ]] 
then
  echo "Max power saving settings"
##Networking down:
  service network-manager stop
  /etc/init.d/networking stop
  modprobe -r iwlagn bnep btusb
  killall nm-applet
fi

if [[ $1 == "restore" ]] 
then
  echo "Restoring Medium power saving settings"
  service network-manager start
  /etc/init.d/networking start
  sudo modprobe iwlagn 
  sudo modprobe bnep 
  sudo modprobe btusb
  nm-applet &
  dropbox start &
fi
powertop

Usage: run the script as root when you are on battery (bluetooth gets disabled).

For max battery life run it with the option "max" (networking gets disabled).
To restore normal operation run it with option restore.