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
