root@linaro-alip:~# modprobe 8192cu
ERR: script_parser_fetch usb_controller_type failed
<6>[sw-ehci2]: enable ehci
[sw-ehci2]: open clock
[sw-ehci2]: Set USB Power ON
<6>sw-ehci sw-ehci.2: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
<6>sw-ehci sw-ehci.2: new USB bus registered, assigned bus number 3
<6>sw-ehci sw-ehci.2: irq 40, io mem 0x01c1c000
<6>sw-ehci sw-ehci.2: USB 2.0 started, EHCI 1.00
ehci_irq: port change detect
<6>hub 3-0:1.0: USB hub found
<6>hub 3-0:1.0: 1 port detected
<6>usbcore: registered new interface driver rtl8192cu
root@linaro-alip:~# <6>usb 3-1: new high-speed USB device number 2 using sw-ehci
ehci_irq: port change detect
ehci_irq: port change detect
<6>usb 3-1: USB disconnect, device number 2
ehci_irq: port change detect
ehci_irq: port change detect
<6>usb 3-1: new high-speed USB device number 3 using sw-ehci
<3>hub 3-0:1.0: unable to enumerate USB device on port 1
[   89.858662] hub 3-0:1.0: unable to enumerate USB device on port 1
ehci_irq: port change detect
The port change to OHCI now!