[CentOS] USB key problems on enterprise systems

Johnny Hughes mailing-lists at hughesjr.com
Sat Mar 4 02:41:46 UTC 2006

On Fri, 2006-03-03 at 19:32 -0700, Collins Richey wrote:
> Just came up with some interesting (read: frustrating) problems on
> RHEL3 and RHEL4 today at work, and I've confirmed one of the problems
> on my up-to-date CentOS4 system at home. I was forced into releasing
> some RHEL3 systems to replace our aging RH9 systems without time for
> adequate testing, and that leads to problems like these.
> On our legacy RH9 systems, mounting a USB key is no problem, but I
> can't get it to work on either RHEL3-U6 or RHEL4-U2 (= CentOS4). I'm
> curious if any CentOS3 or CentOS4 users have any suggestions.
> Here are the results from plugging in a USB Key and trying to mount it:
> 1. On RHEL3-U6, some systems get the following, and there is a workaround:
> Message: USB device not accepting new address
> Workaround: /sbin/modprobe -r ehci-hcd
> Message: READ CAPACITY failed
> ...
> Unable to read partition table
> Workareound: none that I am aware of. The above workaround has no effect.
> 3. RHEL4-U2 and CentOS4 get the following:
> No possibility to mount. As soon as you plug  in the USB key, the
> system goes into a SCSI error loop until you unplug it.
> I've googled extensively for an answer, found a few hits for the RHEL3
> problem, but no useful solutions.
> The RHEL4 problem is apparrently a 2.6 kernel bug. Doe anyone know of
> a packaged kernel solution for this? I'm using the CentOS unsupported
> kernel at home, but same problem as in the stock RHEL4 kernel. Have RH
> possibly fixed this in the U3 beta?
> In case you're wondering about the key(s), the mount works flawlessly
> including KDE automounting the key on my Kubuntu Dapper development
> system with kernel 2.6.15-16-386 #1 PREEMPT.
> TIA,
> --
> Collins Richey
>       The agnostic dyslexic insomniac lies awake wondering if there is a dog.
> _______________________________________________

You might try the CentOSPlus kernel as it has some added hardware turned
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