[ltp] what to use to save battery

[Jiang Qian]

> 
> http://lwn.net/Articles/143397/
> 
> in my thinkpad and X60s there is an internal USBV1 bus, and the kernel
> activate that bus, because there is the fingerprint reader on it (and
> bluetooth).
> 
> just unbind the usb host controller, and the cpu can use C3/C4. To use
> bluetooth it should fairly simple to script the "bluetooth" button to first
> bind the bus.. 
Since I don't use bluetooth, but do occasionally  us fingerprint reader, 
may I ask how can I disable fingerprint reader when I'm on battery, 
(unloading some usb modules?) but re-enable it when I'm on AC? Which 
modules shall I unload to disable all usb and re-enable it later?
Thanks
Jiang
>