From the USB host perspective, USB ports must provide power
pretty much all the time. It is up to the device to draw the
proper amount of power permitted by the spec. Since
"USB lights" are not really USB devices, they violate this
spec and draw full power all the time. It would be really
cool if someone made a true USB light that could be controlled by
software.
Some hubs have the ability to control individual port power, but
there is no software support in the hub driver to do anything but turn
this power on when a hub is initialized. If you really
wanted to, you could find a hub with individual port power control,
and build a custom hub driver with software interfaces to control a
ports power. Now the USB light doesn't look like a USB device,
so you won't really know which port it is attached to. This
would come the closest to what you are asking.
Regards,
David Ferguson
USB Software Team
Apple Computer
At 11:49 PM -0600 2/9/05, Dustin Robert Kick wrote:
I have a question, maybe too silly, but
here goes. Could the light on a USB light could be programmed to
turn on or off at the programmers will, or is the USB power hard wired
away from any logic switches?
http://www.pctoys.com/usbtoys.html
Dustin
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