I am also having problems with USB3 hub. When plugging a hub in the USB3 top port, the journal log is filled with
usb usb6-port1: Cannot enable. Maybe the USB cable is bad?
lsusb -t gives:
/: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci-hcd/1p, 480M
/: Bus 002.Port 001: Dev 001, Class=root_hub, Driver=ehci-platform/1p, 480M
|__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 004: Dev 003, If 0, Class=Hub, Driver=hub/4p, 480M
/: Bus 003.Port 001: Dev 001, Class=root_hub, Driver=ehci-platform/1p, 480M
/: Bus 004.Port 001: Dev 001, Class=root_hub, Driver=ohci-platform/1p, 12M
|__ Port 001: Dev 003, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
/: Bus 005.Port 001: Dev 001, Class=root_hub, Driver=ohci-platform/1p, 12M
/: Bus 006.Port 001: Dev 001, Class=root_hub, Driver=xhci-hcd/1p, 5000M
Plugging a USB3 drives without a hub works correctly. Everything works fine with legacy kernel.