powersave options for Debian on ThinkPad X220

rc.local

#!/bin/sh +e

# wlan power saving
iw dev wlp3s0 set power_save on

# disable ethernet wake-on-lan
ethtool -s enp0s25 wol d

# audio codec power management
echo '1' > '/sys/module/snd_hda_intel/parameters/power_save'

# turn off nmi watchdog
echo '0' > '/proc/sys/kernel/nmi_watchdog'

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

# sata power management
for i in /sys/class/scsi_host/*; do
	if [ -e "$i/link_power_management_policy" ]; then
		echo 'min_power' > "$i/link_power_management_policy"
	fi
done

# chipset power management
for i in /sys/bus/pci/devices/*; do
	if [ -e "$i/power/control" ]; then
		echo 'auto' > "$i/power/control";
	fi
done

# i2c adapter power management
for i in /sys/bus/i2c/devices/*; do
	if [ -e "$i/device/power/control" ]; then
		echo 'auto' > "$i/device/power/control";
	fi
done

# usb power management
for i in /sys/bus/usb/devices/*; do
	if [ -e "$i/power/control" ]; then
		echo 'auto' > "$i/power/control";
	fi
done

exit 0