port speeds

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    Windows 7 Acer 5560 USB 2.0 ports intermittently changes to 1.0

    My Acer 5560 laptop has developed a USB speed problem. When I boot up, my external USB 3.0 HD is connected to a standard enhanced host controller (usb 2.0 driver) and initially works fine. Then for some strange reason the port changes to a standard OpenHCD controller (usb 1.0 driver) and I get...