Going to weigh in as I'm having almost exactly the same issue. While I don't know the technical aspects of my drivers, versions, etc my U2515H is also randomly going to black and then back at arbitrary times. I'm also using an mDP connector and a Nvidia graphics card (Nvidia GeForce GTX 960). I'm seen quite a bit of chatter on the web on this issue so hoping the resolution is a common one. Thanks.
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