Surface Dock vs 4K display

To get the full context of this note you’ll need to read Surface Book and a 4K Monitor.

First, I really wanted this to work because I like the Surface Dock.  It’s a thoughtfully designed device and unlike its predecessors, it’s not tied to a specific Surface Model. If you’ve got a Surface Pro 3 or later or a Surface Book. this could serve you very well.

 

Unfortunately I could not get it to work with my 4K TV/Monitor.

It worked fine to duplicate the  Surface Book display giving me
3000 x 2000 resolution.  But if I wanted to extend my desktop to the external monitor,  it would not offer me the full 4k option  
3840 x 2160.  It also worked in extend the desktop mode if I was willing to use the external display at 1920 x 1080.  But I was getting the full 3840 x 2160 experience with a direct connection to the monitor and I’m unwilling to give that up.

The Surface Dock connector goes into the Surface Book power port, but it covers access to the mini-display port adapter port so I can’t connect the Surface Dock and run a monitor directly from the Surface Book.

I really wanted to keep it and if I had been able to connect the monitor directly to the Surface Book at the same time, I would have.