I have verified that the USB 3 kernel module is loaded and that USB 3 is 
displayed by lshw .

When I plug a USB 3 enable external drive into the USB 3 port, the drive 
acknowledges the presences of USB 3 (for this unit, the text SUPERSPEED 
illuminates).  However, there is no created USB /dev/sde .  When I plug 
the same external drive into a USB 2 port, the USB 3 acknowledgement is 
not displayed, but there is a created USB /dev/sde.

Here are the relevant sections of the output from lshw:

Comment:  USB 3 present, module xhci_hcd appears

   *-usb
                 description: USB Controller
                 product: uPD720200 USB 3.0 Host Controller
                 vendor: NEC Corporation
                 physical id: 0
                 bus info: pci@0000:02:00.0
                 version: 03
                 width: 64 bits
                 clock: 33MHz
                 capabilities: pm msi msix pciexpress bus_master cap_list
                 configuration: driver=xhci_hcd latency=0
                 resources: irq:18 memory:f5efa000-f5efbfff
               *-usbhost
                    product: xHCI Host Controller
                    vendor: Linux 2.6.32-131.2.1.el6.x86_64 xhci_hcd
                    physical id: 1
                    bus info: usb@8
                    logical name: usb8
                    version: 2.06
                    capabilities: usb-3.00
                    configuration: driver=hub slots=4 speed=5000Mbit/s

Comment:  /dev/sde creation under USB 2

  *-usb:5
              description: USB Controller
              product: SB700/SB800 USB EHCI Controller
              vendor: ATI Technologies Inc
              physical id: 13.2
              bus info: pci@0000:00:13.2
              version: 00
              width: 32 bits
              clock: 66MHz
              capabilities: pm debug ehci bus_master cap_list
              configuration: driver=ehci_hcd latency=64
              resources: irq:19 memory:f5cfec00-f5cfecff
            *-usbhost
                 product: EHCI Host Controller
                 vendor: Linux 2.6.32-131.2.1.el6.x86_64 ehci_hcd
                 physical id: 1
                 bus info: usb@2
                 logical name: usb2
                 version: 2.06
                 capabilities: usb-2.00
                 configuration: driver=hub slots=6 speed=480Mbit/s
               *-usb
                    description: Mass storage device
                    product: USB to ATA/ATAPI Bridge
                    vendor: JMicron
                    physical id: 4
                    bus info: usb@2:4
                    logical name: scsi8
                    version: 1.00
                    serial: 2469CB506135
                    capabilities: usb-2.10 scsi emulated scsi-host
                    configuration: driver=usb-storage maxpower=2mA 
speed=480Mbit/s
                  *-disk
                       description: SCSI Disk
                       physical id: 0.0.0
                       bus info: scsi@8:0.0.0
                       logical name: /dev/sde
                       size: 931GiB (1TB)
                       capabilities: partitioned partitioned:dos
                       configuration: signature=706a2c16

End lshw output.

What else must I do so that the xhci_ehd driver does the same as the 
ehci_ehd driver, and activates an appropriate use of the usb-storage driver?

Yasha Karant