USB 3 problem with OEL 6.3

Hi,
after connecting an external 2.5" HDD (USB 3 ready!!) to one of my USB 3 interfaces I recognized a lot of xhci_hcd warnings. They all look the same.
xhci_hcd 0000:0e:00.0: WARN: Stalled endpoint.
I tried to connect while the OS was running.
According to the output of my lsmod command it seems to be that the xhci_hcd kernel module is loaded but not used. Here is the output:
xhci_hcd 123859 0
In spite of these warnings the HDD seems to work. May be with a reduced speed??
As I am a Linux newbie I don't know how to investigate further or to get rid of this problem.
Could you please give some advice?
Thanks and regards
Volker
P.S. I am using the following kernel: 2.6.39-200.24.1.el6uek.x86_64

Oracle Linux or any other Linux distribution based on the source of RHEL is designed for enterprise server hardware. However, the USB 3 issue you are experiencing is not an issue with Enterprise Linux only and apparently affects other Linux distributions too. The solution for the problem is usually a device firmware and Linux kernel upgrade. You could try to upgrade to OL 6.4 and use the latest Oracle UEK2 kernel or switch to a Debian based desktop distribution, such as Ubuntu, which deploys the latest versions of available Linux software.

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Attachments:
Schermata 2013-11-11 alle 17.13.07.png ‏285 KB

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I recently bought a 160 GB external USB 2.0 drive to
use with my iBook G3 (900 40 GB HD 14” screen) and it
seems to have wacked out my USB ports. One simply
isn’t working at all. Through the other, I use a USB
hub to plug in my drive and other USB devices. I have
the drive partitioned into a backup, a folder for my
iTunes music, and one general purpose partition. The
icons don’t always show up on my desktop without
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Possibly, depends on the drive and how it has been configured.
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