Everything works fine for me now. I also had this problem since Feisty. I 
thougt I give it a try and here we go.
Just attached a USB-Hub and 2 Stick's and one scanner. And no more problmes. :-)
Attached is a small output from dmesg.

** Attachment added: "dmesg.txt"
   http://launchpadlibrarian.net/10252769/dmesg.txt

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ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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