2nd mouse not recognized

[oxy]

Hi,

since last week a 2nd optical usb mouse from the same usb hub
cannot be recognized in my ubuntu 12.04 64bit.

Everything else works: 2nd mouse directly in the tower, each mouse
separately plugged at usb hub etc.

Funny error. Could only find this in my mesg:

[  540.253651] usb 5-1.4.3: new low-speed USB device number 16 using xhci_hcd
[  540.282614] usb 5-1.4.3: ep 0x81 - rounding interval to 64
microframes, ep desc says 80 microframes

Does it make sense to you?

thx...