Sarah, on a related note: Is there a parameter or knob of some kind to tell the XHCI driver to treat a specific port as USB2 (480mbit/sec max) rather than USB3 ? The Dell XPS-13 Ultrabooks all suffer from some kind of flaw, whereby the left side USB3 port is unreliable at SuperSpeed; the right side port works flawlessly. The MS-Windows driver has a workaround of some sort, but we don't. Cheers -- Mark Lord Real-Time Remedies Inc. mlord@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html