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.
ml...@pobox.com
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