Power Save Script

I wrote a little powersave script that quickly executes a few commands to improve battery life, esp. on notebooks. You can put it in /etc/acpi/battery.d/20-powersave.sh to start automatically when the computer runs on battery.

#!/bin/bash

SUDO=`which sudo`
SU=`which su`
EXEC="$SUDO $SU -c"

echo Activating power saving mode...

# Automatically suspend USB -- How to automatize?
# usbcore.autosuspend=1 to kernel cmdline didnt work
$EXEC "echo 1 > /sys/module/usbcore/parameters/autosuspend"

# Disable CD autodetection by hal
# sudo hal-disable-polling --device /dev/scd0

$EXEC "ethtool -s eth0 wol d"

# reduce disk writes
$EXEC "echo 1500 > /proc/sys/vm/dirty_writeback_centisecs"

# SATA powersaving mode
$EXEC "echo min_power > /sys/class/scsi_host/host0/link_power_management_policy"

# AC97 power saving
$EXEC "echo 1 > /sys/module/snd_ac97_codec/parameters/power_save"

# Intel-HDA power saving
$EXEC "echo 1 > /sys/module/snd_hda_intel/parameters/power_save"

# optimize scheduling for dual-core cpus
$EXEC "echo 1 > /sys/devices/system/cpu/sched_mc_power_savings"

# Remove fixed network adapter, intel watchdog
sudo rmmod iTCO_wdt iTCO_vendor_support tg3

# set minimum frequency
#$EXEC "echo 866664 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq"

sudo killall guidance-power-manager.py

xrandr --output TV --off

for i in /sys/bus/usb/devices/%s/power/autosuspend; do $EXEC "echo 1 > $i"; done

$SUDO iwconfig wlan0 power on

Actually I think a part of the script might be from someone else...