Thank you for your reply.
Yes the usb-devices command gives a lot of information.
I have read about companion usb 1.1 devices at https://bbs.archlinux.org/viewtopic.php?id=172005
I will try to turn off the companion function by issuing:
where x is the usb 1.1 fall back port
echo -x > /sys/bus/usb/devices/usb1/../companion
I still wonder where to find documentation on how to revert to the behavior of the old versions of the kernel (3.2.x) where usb didn't fall back to uhci-hcd on ehci_hcd errors