some power saving settings

rc.local

#!/bin/bash
for i in `find /sys/bus/usb/devices/*/power/control`; do
    echo auto > $i
done
for i in `find /sys/bus/usb/devices/*/power/autosuspend`; do
    echo 2 > $i
done
echo 0 > /proc/sys/kernel/nmi_watchdog
echo 1 > /sys/module/snd_hda_intel/parameters/power_save
for DEVICE in /sys/bus/{pci,spi,i2c}/devices/*; do
    [ -d "$DEVICE" ] || continue
    CONTROL="$DEVICE/power/control"
    [ -w "$CONTROL" ] || continue
    echo auto > $CONTROL
done
#iw dev wlp4s0 set power_save off
ethtool -s enp0s31f6 wol d