Hi again,

Have you loaded the xhci driver? If your device attaches to the XHCI driver then it cannot be switched to FULL speed only.

Also look for other USB devices which have "none" as driver.

none2@pci0:13:0:0:      class=0x0c0330 card=0x21d217aa chip=0x01941033
rev=0x04 hdr=0x00
     vendor     = 'NEC Corporation'
     device     = 'uPD720200 USB 3.0 Host Controller'
     class      = serial bus
     subclass   = USB

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