On Thu, Jul 25, 2013 at 12:52 AM, Juan Lang <juanl...@google.com> wrote: > Hi there, > > I've got a little test program that I'm running against a device I have, > which is supported by the winusb driver. > ... > > Naturally it succeeds when the device is inserted in a USB 2.0 port. I've > verified the problem on an HP z420 with a TI USB 3.0 controller/drivers, and > on a ThinkPad T430 with Intel-provided controller/drivers. > > Any idea what gives? Thanks,
Firstly take note that USB 3.0 under Windows XP/Vista/7 are potentially problematic since they use the vendor provided USB Driver Stack and not Microsoft's. If you can, please try one computer with Windows 8 and USB 3.0 to see if the problem exists or not. Secondly, for Windows 7, you can try to update your xHCI controller to use the latest vendor driver and latest firmware to see if that helps or not. You can also try to use usbview to see if it can find your device or not. If usbview works, most likely libusbx will work since they use similar standard Windows setupapi API functions which unfortunally many vendor xHCI driver stacks do not work well. USBView is part of Microsoft WDK. But you can get an older vendor version from FTDI as well. http://www.ftdichip.com/Support/Utilities.htm You can also try to reinstall WinUSB driver using Zadig. -- Xiaofan ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
