that's what I see with dmesg when I disconnect and connect the usb device:

[1383334.592844] usb 3-1: USB disconnect, device number 2

[1383642.059110] ehci_irq: port change detect
[1383642.106558] ehci_irq: port change detect
[1383642.529237] usb 3-1: new low-speed USB device number 3 using sw-ohci
[1383642.769738] generic-usb 0003:1941:8021.0006: hiddev0,hidraw0: USB HID 
v1.00 Device [HID 1941:8021] on usb-sw-ohci-1/input0

and that's what lsusb gives me with and without device:

 lsusb -v
 lsusb -v

yes -> nothing! :-)

but lsusb -t gives me the following output (without):

root@wetter:~# lsusb -t
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=sw_hcd_host0/1p, 480M

and with device:
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M
    |__ Port 1: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 
1.5M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=sw_hcd_host0/1p, 480M

thank you for having a look at my problem! :-)

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