I have a 34 inch 3440 x 1440 widescreen display and a Surface Pro 6 (and dock). All other MiniDisplayPort adapters limited my resolution to 1080p. Tip for Surface Pro users: I had to take extra steps to get the correct resolution. First I had to connect directly to my surface and then go to the dock. I also had to return my graphics card adapter. I suspect that last part is because I used to use a DisplayPort adapter.
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