I cannot get the HDMI port to work on this usb-c dock with an elite x2 tab. dport works, Latest bios installed and no drivers are missing that I can see in Dev. mgr. everything else on the dock is working. I now have only the hdmi port connected to an hp elitedisplay monitor with an hdmi to dport cable . No monitor is detected. Displaylink also does not detet any external monitor. Please help.