Comment 55 for bug 296710

That's right Paul. I'm having issues now too, as I have defective usb 2.0 hardware (usb 1.1 is working flawlessly via the same usb connector) so I used to unload the ehci-hcd which is not possible anymore with the latest kernel revision 2.6.28-11.40 because *hci-hcd are built-in now.
So I either have to get new hardware or recompile my kernel...