after i did echo -n -1 > /sys/module/usbcore/parameters/autosuspend it was 
better, i got less messages if the kind 
Oct 11 15:12:38 hermann-server kernel: [ 1226.568000] usb 3-1: new high speed 
USB device using ehci_hcd and address 6
Oct 11 15:12:43 hermann-server kernel: [ 1231.588000] usb 3-1: device 
descriptor read/8, error -110
Oct 11 15:12:48 hermann-server kernel: [ 1236.708000] usb 3-1: device 
descriptor read/8, error -110

but after coping 150MB the disc  was "unsavely unmounted" :) , so it still 
exist for me even after 
after i did echo -n -1 > /sys/module/usbcore/parameters/autosuspend .

a modprobe -r ehci_hcd is still the one and only thing what works for
me, to ensure that my usb2.0 hdd works. But thats a problem 500GB with
usb1.1 ...

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USB devices are not recognized when having ehci_hcd modprobed
https://bugs.launchpad.net/bugs/88746
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Bugs, which is the bug contact for Ubuntu.

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