Mouse blinks and trail on click-and-drag
 

When I connect a Dell docking station D3100 (http://accessories.euro.dell.com/sna...1&sku=452-BBOT) with a HDMI screen connected to it, I manage to detect and get a display on the second screen but the mouse blinks and I have a trail when I click and drag something (see image enclosed). It happens on both screens. I work on Ubuntu 16.04.