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May be unrelated but I found a "problem" using the USB2 port on a laptop with USB3 ports...
It turned out that the internal USB driver/ configuration did not give a "compatible" USB2 connection!
(I found this out using a USB2 DMK51 camera which will NOT function above 50% frame rate when connected to a USB3 port - Ok, just connect it to the USB2 port -wrong! somehow it still seemed to be acting as a USB3.....)
The "smart" guys suggested removing "USB3 XHCI" from the BIOS, but I wasn't game to try it......
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