power management and modules

[Arjan van de Ven]

Ganesha Bhaskara wrote:
> On my laptop, I rarely use USB or any other peripherals that can be
> attached to it. I end up executing the following to reduce the number of
> wakeups.
> 
> rmmod ehci_hcd uhci_hcd ohci1394 tifm_7xx1 b44
> 
> Does this affect power management of the concerned devices ? Do I
> require the modules to put the corresponding devices to low power states ?
> 

in theory the general linux rule is that a module powers down the hw 
when it unloads (unless the hardware cannot cope with that)

Unfortunately not all modules adhere to that ;(