On 07/05/2011 10:24 AM, Yasha Karant wrote:
> 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

In addition to the above information, dmesg reports:

xhci_hcd 0000:02:00.0: Timeout while waiting for stop endpoint command

xhci_hcd 0000:02:00.0: Timeout while waiting for a slot

Note that the USB 3 device is recognized on a USB 2 port according to dmesg:

usb 2-4: new high speed USB device using ehci_hcd and address 3
usb 2-4: New USB device found, idVendor=152d, idProduct=0551
usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=5
usb 2-4: Product: USB to ATA/ATAPI Bridge
usb 2-4: Manufacturer: JMicron
usb 2-4: SerialNumber: 2469CB506135
usb 2-4: configuration #1 chosen from 1 choice
Initializing USB Mass Storage driver...
scsi6 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 3
usb-storage: waiting for device to settle before scanning
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usb-storage: device scan complete
scsi 6:0:0:0: Direct-Access     SAMSUNG  HD103SJ               PQ: 0 
ANSI: 2 CCS
sd 6:0:0:0: Attached scsi generic sg5 type 0

I have searched for this issue on the web, and only found a comment from 
an Ubuntu forum that suggested posting a bug against the relevant kernel 
.  Does anyone have experience with this problem and/or a suggested fix? 
  Is anyone successfully automounting an USB 3 external hard drive?

This machine has kernel  2.6.32-131.2.1.el6.x86_64 .

Yasha Karant