I just got a new SP4. When I plug it into a monitor (mini display port to HDMI adapter), the maximum resolution I can select is 1920 x 1080. However, the monitor's native resolution is 2560 x 1080, and using exactly the same adapter and cable, my Surface Pro 3 gives me 2560 x 1080 resolution on this monitor. I've replaced the graphics driver with the latest version downloaded from Into (Iris 540), which provides a utility to set up a custom resolution. But, when I try to do that, the utility gives me an error saying "custom resolution exceeds maximum bandwidth capacity". What is going on, and how do I fix this?