USB monitor refresh

[CS_DBA]

Hi All;

I bought a usb powered portable monitor (AOC e1649Fwu) for when I travel...

If I plug in the usb connections before I boot my laptop it works 
(Fedora 20, Lenovo W540)
however the refresh rate is slow (I'm guessing) as it doesnt refresh the 
screen until I pass the mouse cursor over that area.

It is usable but sortof a pain... thoughts on how to debug/fix this?

Thanks in advance