On Mon, 11 Jul 2011, Yasha Karant wrote:

> I have been attempting to get a working USB 3 external harddrive
> subsystem.  Thus far, no go.
>
> Here is what I have found:
>
> 1.  kernel 2.6.38.6-26.rc1.fc15.x86_64 works fine for USB 3, but
> requires gcc 4.6 to build any kernel modules; RHEL 6 (SL 6, CentOS 6)
> uses gcc 4.4.  Thus, neither the Nvidia nor VirtualBox modules will
> build on on a RHEL 6 system.
>
> 2.  kernel 2.6.33.3-85.fc13.x86_64 that was built with gcc 4.4 works,
> but only partially -- please see point 3.
>
> 3.  After installing both of the above kernels, kernel
> 2.6.32-131.2.1.el6.x86_64 now functions essentially the same as
> 2.6.33.3-85.fc13.x86_64 .  The device is recognized and /dev/sde and the
> partitions thereunder /dev/sde1 ... are created.  However, no automount
> points are created that were created with 2.6.38.6-26.rc1.fc15.x86_64 .
> Moreover, fdisk /dev/sde fails.  A reading of dmesg shows numerous
> exceptions and diagnostics that are documented in USB 3 linux kernel
> development hits during a web search and that evidently were fixed in
> later kernels (such as 2.6.38.6-26.rc1.fc15.x86_64 ).  I am not going to
> reproduce these here, but suffice it to say that the /dev/sde set
> appears, vanishes as evidenced by the output of /ls/dev/sd* and then
> reappears.
>
> Note that all of the hardware and systems commands, etc., work on a USB
> 2 port on this system.
>
> An attempt to build from source 2.6.38.6-26.rc1.fc15.x86_64 using the
> gcc 4.4 system of SL6 is my next step, rpmbuild --rebuild
> kernel-2.6.38.6-26.rc1.fc15.src.rpm  .
>
> Yasha Karant
>

Since usb 3 worked for your chipsets on a prior RHEL 6 kernel and does not 
work on the current RHEL 6 kernel .  I suggest you search 
bugzilla.redhat.com looking for your issue.  If you do not find the issue 
please bugzilla it.

-Connie Sieh