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    SubjectRe: Cut power to a USB port?
    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.


    ---
    ~Randy
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