title: monogame screen resolution is incorrect
body: <p>Monogame, or XNA really, is reporting the wrong screen resolution on my Surface Pro 3.</p>
  
  <p>Using GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Width and Height returns dimensions of 800 x 600, which is incorrect. So, I cannot set up my game size correctly.</p>
  
  <p>I've been using this code without problem on an Acer V5 and can set the game resolution to a size I expect. This is because the GraphicsAdapter reports the correct screen size.</p>
  
  <p>Whether using it as is, or docking the tablet with an external monitor, returns exactly the same resolution. What error is causing this?</p>