Puts my keyboard and mouse to sleep, ie turns off the leds when the screen goes to sleep

kbm_sleep.sh

#!/bin/bash
old_dpms=""
while true; do
    dpms=$(xset -q|grep Monitor|awk '{print $3;}')
    if [ "$dpms" != "$old_dpms" ]; then
        old_dpms=$dpms
        if [ "$dpms" == "Off" ]; then
            echo "Puting keyboard and mouse to sleep"
            echo auto | sudo tee /sys/bus/usb/devices/3-13/power/control
            echo auto | sudo tee /sys/bus/usb/devices/3-14/power/control
        else
            echo "Waking keyboard and mouse"
            echo on | sudo tee /sys/bus/usb/devices/3-13/power/control
            echo on | sudo tee /sys/bus/usb/devices/3-14/power/control
        fi
    fi
    sleep 1
done