Messages in this thread | | | Date | Tue, 2 Jan 2007 08:36:50 -0800 | From | Randy Dunlap <> | Subject | Re: Cut power to a USB port? |
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On Tue, 02 Jan 2007 10:28:38 -0500 Andrew Barr wrote:
> On Tue, 2007-01-02 at 00:32 -0800, Greg KH wrote: > > On Mon, Jan 01, 2007 at 03:56:25PM -0500, Andrew Barr wrote: > > > I have a simple question perhaps someone can help me with here... > > > > > > I have one of those simple LED keyboard lamps that get their power from > > > the USB port. Is there some way in Linux, using files under /sys I would > > > imagine, to cut power to the USB port into which this lamp is plugged? I > > > know I would have to manually figure out what port it's plugged into, as > > > it is not a "real" USB device...e.g. it just draws power. I would like > > > to be able to programmatically switch the lamp on and off. > > > > Search the archives of the linux-usb-devel mailing list for a program > > that might do this for you (depending on your hardware.) > > What search terms should I use? Searching on "power" and "port power" at > Gmane in the gmane.linux.usb.devel group doesn't readily give me > anything.
You can try:
usbpoweroff.c (http://www.informatik.uni-halle.de/~ladischc/usbpoweroff.c) or hub-ctrl-2.c (http://www.gniibe.org/log/linux)
> For the record, my hardware: > > 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01) > 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01) > 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01) > 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 > EHCI Controller (rev 01) > > IBM Thinkpad R51 2883-ELU.
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