On Tue, 2007-01-02 at 08:36 -0800, Randy Dunlap wrote: > 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)
Hm, my hardware must not support it. The hub-ctrl-2.c program fails with a broken pipe and the usbpoweroff.c program silently does nothing, exiting returning zero. Thanks to you all anyway, Andrew > > 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
