Kernel log. All 8 attempts were on one of the USB3 port on the left, not on any of the USB2 ports on the right, notice the first worked with mention:
> Jan 22 13:02:50 n55sf-l kernel: [ 152.219714] usb 3-2: new high-speed USB device number 2 using xhci_hcd
which indicates USB2 speed not USB3.
Kernel log. All 8 attempts were on one of the USB3 port on the left, not on any of the USB2 ports on the right, notice the first worked with mention:
> Jan 22 13:02:50 n55sf-l kernel: [ 152.219714] usb 3-2: new high-speed USB device number 2 using xhci_hcd
which indicates USB2 speed not USB3.