On Wed, 30 Aug 2006, Matthias Urlichs wrote:

> Hello,
> 
> I need to disable (i.e., turn off power and everything) one of my UHCI
> ports.
> 
> "echo -n 2 >/sys/bus/usb/devices/usb4/power/state" does not do that.
> 
> Is that possible? If not, what would be involved in adding support for it?
> 
> The reason I need that feature is a misbehaving device; every few hours it
> gets enough EMI from the GSM module sitting right next to it that it goes
> off to la-la land. I haven't found any way to reset it, other than to
> unplug it, and I'd like to do that in software.

There is no way to do it.  The UHCI hardware is not capable of turning off 
power to any of its ports.

On the other hand, some external hubs are capable (although a lot aren't).  
Check out this web page:

        http://www.gniibe.org/ac-power-by-usb/ac-power-control.html

Alan Stern


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