dmesg:
usb 2-1: new high-speed USB device number 7 using xhci_hcd
usb 2-1: New USB device found, idVendor=1d5c, idProduct=2000
usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
There is your problem .... it should say "Super Speed" for a USB3 device.
There has been several reports that some low quality devices just are
broken out-of-the-box ...
Some with the super speed wires badly soldered or at the wrong place.
Cheers,
Sylvain