Getting the Battery to Last Longer

I've added these lines to my/etc/rc.local to make my Thinkpad X300 laptop use less power. The tips are gathered from running the excellentpowertop from Intel.

# This wakes the disk up less frequently for background VM activity
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs

# Disable the unused bluetooth interface with the following command:
hciconfig hci0 down ; rmmod hci_usb

# Disable 'hal' from polling your cdrom with:
hal-disable-polling --device /dev/cdrom

# SATA ALPM link power management via:
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy

# Disable Ethernet Wake-On-Lan with the following command:
ethtool -s eth0 wol d

And I've added a directive about USB auto suspension to my GRUB configuration,/etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet vga=791 usbcore.autosuspend=1"

On myThinkpad T420s, I added this to my /etc/rc.local:

# Dynamic power save
iw wlan0 set power_save on

echo 0 > /proc/sys/kernel/nmi_watchdog

# Enable SATA link power management for /dev/sda
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
echo min_power > /sys/class/scsi_host/host1/link_power_management_policy

# VM writeback timeout
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs

# Sound power management
echo Y > /sys/module/snd_hda_intel/parameters/power_save_controller
echo 1 > /sys/module/snd_hda_intel/parameters/power_save

# Power aware CPU scheduler
echo 1 > /sys/devices/system/cpu/sched_mc_power_savings

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