I know that this is generally an issue with displayport - I've had the issue in one way or another across a couple of laptops/docking stations/monitors. Now my setup is a SP3 with docking station connected to a Dell 4k monitor. On 8.1 I had this issue on occasion, but it generally worked reliably. On 10, every time I resume from hibernate, I get no display on the Dell monitor until I unplug the power of the monitor and reconnect, then it works every time. Unfortunately that completely resizes and shuffles all my windows which is an even bigger pain than the unplugging. Anyone have any suggestions of a fix?