Acer C720: Is it worth to turn off unused devices?

[Romick]

like put next lines in /etc/rc.local?

======================================
#!/bin/sh

# Turn off video camera
/usr/sbin/usbconfig -d 1.3 power_off

# Turn off Atheros bluetooth
/usr/sbin/usbconfig -d 1.4 power_off
======================================

I'm still looking for saving battery.

-- 
  with best reagrds, Yellow Rabbit
  DragonFly 4.1-DEVELOPMENT x86_64