Has anyone been able to drive a 21:9 monitor successfully from a Surface Book?

I recently picked up a 34" LG monitor and have had nothing but disappointment from it when attached to a Surface Book. When attached to my original Surface Pro and my later SP3, the monitor functions perfectly at max res of 2560 x 1080 and works either as a primary or extended display. On the Book, it won't display at a res above 1920 x 1080, which leaves black areas left and right on the screen. Display settings allow me to call for 2560 x 1080 (recommended) but Apply won't change the display and I get the red-letter message that the settings cannot be saved. There are additional problems depending on whether I plug the monitor directly into the Book or run it through one of the display ports on the Surface Dock. Sometimes I can extend the displays from Book screen to LG, but mostly I have to choose between Screen 1 and Screen 2. The random nature of these problems is making it hard to diagnose an underlying difficulty. I also get two- to four-second blackouts on the external monitor every two to five minutes when the display is loafing and much more frequently when scrolling through large web pages or moving from tab to tab.

I'd really like to hear that somebody else is successfully driving an ultrawide monitor from a Book, because that would give me hope that my machine can be used as I want to use it. If this turns out to be a universal problem, the Book (which I otherwise very much like) is going to be demoted to my secondary machine and I will go back to the SP3.

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