Heavy increase in idle power between 2.6.22 and .24

[Baeckham]

Am Tuesday, 5. February 2008 schrieb Arjan van de Ven:
> Dietz Proepper wrote:
> > Hi,
> >
> > yesterday I noticed a strange behaviour regarding the 2.6.24 kernel: The
> > idle power consumption went up to around 21 W, while it was around 16.5W
> > with a 2.6.22 kernel with ahaci powersave patch applied. The kernel
> > configuration stayed untouched.
>
> a prime suspect is the usb power saving; it now defaults to off by default

I recognized an heavy increase on the power consumption too. With kernel 
2.6.22 I got about 16 W now it is 24 W when the system is idle ...

How to turn on usb power saving? I can not find anything about it in kernel 
config ...

But even if I unload all usb related modules the system uses more power with 
2.6.24 than with 2.6.22.

Steffen