How are you connecting? DisplayPort, HDMI, DVI or VGA? Because you're on a docking port, if it's a Surface one, I'm assuming miniDP > DP.
Monitor set to run at DisplayPort 1.2?I have a Samsung S34E790C curved widescreen monitor with native resolution of 3440 x 1440 with 60hz using DisplayPort.
I was not able to get the Surface Book to look right so I used it's dual HDMI input with 2-cablematters mini DisplayPort to hdmi adapters to the Samsung using PBP at a resolution of 1720 x 1440 for each screen. It works ok on the video side but I can't get the audio to work through the HDMI correctly, it sounds garbled. I'd also like to know if maybe I'm not using the best connection for the Samsung but I didn't see a resolution in the SB of 3440 x 1440 when I connected using just the DisplayPort.
I meant to answer this earlier but I don't have anything to show what cable this is. I don't know and I guess I don't understand why the cable would make a difference. If you think I should buy the correct cable I will, maybe Best Buy or Staples.And you're sure your cables spec'ed at v1.2 as well?