I intentionally purchased the GTX 960 with 3x DisplayPort 1.2 interfaces, one HDMI 2.0, and one DVI interface, anticipating three 4K displays each running at 3840x2160@60Hz.
I am using version 346.72 of the driver, with Kernel 4.2.5. But I used 4.0.9 until this issue started. I am unsure which Kernel version I need to use to be able to use +355.* of the driver. I am using Mint Linux 17.2 with X.Org X Server 1.15.1 currently.
For a while I was just using one P2715Q. That was great quality at high resolution, and I had two 1920x1080 displays going also ( via the HDMI and DVI ). Then when I took the plunge into three 4K displays, all Dell P2715Q displays. They all worked… for 30 seconds, without extra configuration.
Then, the third display started flickering - but so profoundly it was as if it actually turned off. It had a nasty black flicker. It happened once, then 5 or so seconds went by, then it started flickering black every few seconds until eventually it would just stay black.
So far the only remedy I’ve found is to run the third display at 2560x1440@60Hz.
Is there some kind of limitation I’m hitting, whether on a driver level or hardware level?
My GTX 960 has 1024 CUDA cores, 4gb of RAM, and so far I see it only using 43% of that RAM… and 5% of the GPU in its natural “desktop only” state, versus gaming or anything too intensive.
Thank you very much for whatever help can be offered.