On my Feisty router Dell PIII-1ghz with custom 2.6.22 kernel, the
following commands appear to work based on suggestions from PowerTOP
1.8: I've added them to my /etc/init.d/rc.local.

echo 10 >/sys/bus/usb/devices/usb1/power/autosuspend
echo auto >/sys/bus/usb/devices/usb1/power/level 

The commands are modified from a thread I found on the USB autosuspend
(which were posted as commands to use with a .23 kernel).

http://www.gossamer-threads.com/lists/linux/kernel/822889

-- 
Powertop suggest to add usbcore.autosuspend=1 to grub's kernel line, doesn't 
work
https://bugs.launchpad.net/bugs/136549
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