Upgrade from r280855 to r281560 (amd64) on a Samsung Ativ Book 2 Laptop. The Synaptics Touchpad stops working, in Xorg.0.log I have the error message : [ 1047.413] (EE) synaptics: Mouse: Unable to query/initialize Synaptics hardware. [ 1047.449] (EE) PreInit returned 11 for "Mouse" Regards Maurizio