Date: Tue, 07 Apr 2015 18:56:06 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Matthias Apitz <guru@unixarea.de>, freebsd-usb@freebsd.org Subject: Re: power off 5V on USB port Message-ID: <55240C26.7000905@selasky.org> In-Reply-To: <20150407133014.GA1790@c720-r276659> References: <20150407133014.GA1790@c720-r276659>
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On 04/07/15 15:30, Matthias Apitz wrote: > > > Hello, > > I'm using an Ubuntu smartphone connected on one of the USB ports to my > netbook as a router to the Internet. I wanted to power-off the USB port to > a) save energy in the netbook and > b) not having the phone always charged for the memory effect in the battery. > > I tried: > > $ usbconfig > ... > ugen0.3: <AquarisE4.5 BQ> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (500mA) > > # usbconfig -d ugen0.3 power_off > # usbconfig -d ugen0.3 > ugen0.3: <AquarisE4.5 BQ> at usbus0, cfg=255 md=HOST spd=HIGH (480Mbps) pwr=OFF (500mA) > > as you can see the state is now pwr=OFF, but in this state the USB port > is not longer usable. What is the correct way to shutdown the 5V > provided via USB to the device? > Not all USB ports support power off. --HPS
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