#!/bin/bash
# Datei: /usr/local/sbin/batteriebetrieb
# http://de.gentoo-wiki.com/Aktivieren_von_Stromsparfunktionen

batteriebetrieb () {
  # disable not needed services
  /etc/init.d/rsyslog stop
  #/etc/init.d/setroubleshoot stop
  # Screen and graphics
  # Reduce screen brightness
  echo "37" > /proc/acpi/video/VGA/LCD/brightness
  # I've applied some power saving tricks from lesswatts.org
  # add these two lines to /etc/X11/xinit/xintrc (system wide)
~./.xintrc (user dependent) 
  #/usr/bin/nvidia-settings -a GPU2DClockFreqs=100,100
  #/usr/bin/nvidia-settings -a GPU3DClockFreqs=133,133
  # Bluetooth
  # disable bluetooth
  # hciconfig hci0 down
  # rmmod hci_usb
  # CPU
  # Enable multi-core power saving tunables
  # configures the scheduler to use only one core if it doesn't need two
  /bin/echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
  #ondemand/conservative erzeugt viele wakeups, set to powersave
  /usr/sbin/cpufreq-selector -g conservative
  #echo 1 > /proc/sys/vm/laptop_mode
  # SATA and CD/DVD
  # enable SATA ALPM link power management
  /bin/echo min_power
> /sys/class/scsi_host/host0/link_power_management_policy
  /bin/echo min_power
> /sys/class/scsi_host/host1/link_power_management_policy
  /bin/echo min_power
> /sys/class/scsi_host/host2/link_power_management_policy
  # Decreases disk activity slightly
  echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
  # Enabling the noatime filesystem option
  #/bin/mount -o remount/noatime /
  # Disable polling on CD-devices
  #hal-disable-polling --device /dev/scd0
  # Audio
  # Enable audio power saving
  echo 5 > /sys/module/snd_hda_intel/parameters/power_save
  # Network
  # Enable wireless power saving
  #echo 5 > /sys/bus/pci/drivers/iwl3945/*/power_level
  #iwconfig wlan0 txpower 7
  /sbin/ethtool -s eth0 wol d
#/etc/init.d/undervolt start - if undervolting works for x86_64
  # modules not needed on battery
  MODULE="r8169 i2c_algo_bit mii crc_ccitt  
    pcspkr i2c_i801
  "
  # unload not needed modules on battery
  ENTLADEVERSUCHE=3
  for versuch in $ENTLADEVERSUCHE
  do
    for modul in $MODULE
    do
      /sbin/modprobe -r $modul
    done
  done
}

netzbetrieb () {
  /etc/init.d/rsyslog start
  #/etc/init.d/setroubleshoot start
  # Set screen brightness
  echo "81" > /proc/acpi/video/VGA/LCD/brightness
  # Decreases disk activity slightly
  echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
  # Enable multi-core power saving tunables
  # configures the scheduler to use only one core if it doesn't need two
  /bin/echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
  # Enable audio power saving
  echo 5 > /sys/module/snd_hda_intel/parameters/power_save
  # enable SATA ALPM link power management
  /bin/echo min_power
> /sys/class/scsi_host/host0/link_power_management_policy
  # Enable wireless power saving
  #echo 1 > /sys/bus/pci/drivers/iwl3945/*/power_level  
  #/sbin/iwconfig wlan0 txpower 25mW
  #/sbin/iwconfig ath0 txpower 25mW
  /sbin/ethtool -s eth0 wol d
  /usr/sbin/cpufreq-selector -g ondemand
  #/etc/init.d/undervolt stop
  # modules to load on wall-power
  MODULE="r8169 i2c_algo_bit mii crc_ccitt  
    pcspkr i2c_i801
  "
  # Load the modules on wall-power
  LADEVERSUCHE=3
  for versuch in $LADEVERSUCHE
  do
    for modul in $MODULE
    do
      /sbin/modprobe $modul
    done
  done
}

if [ "`basename $0`" == "batteriebetrieb" ];then
        if [ "$1" == "stop" ]; then netzbetrieb; else batteriebetrieb;fi
elif [ "`basename $0`" == "netzbetrieb" ];then
        if [ "$1" == "stop" ]; then batteriebetrieb; else netzbetrieb;fi
fi