laptops and power to the usb devices

[vladimir at math.uic.edu]

I have a USB logitech camera plugged into the usb port on a
laptop (Thinkpad T23 with a 5.4-BETA1 installed, dualbooting
with XP).  The camera doesn't work in FreeBSD; I use it in
Windows for videoconferencing.   Unfortunately the device
stays powered up in BSD, is there any way to turn the power off
(or to tell the system to completely ignore the camera)?
I supposed I could unplug it from the USB port, but it's a PITA
to do this all the time.
Thanks,
	Vladimir