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I see it repeated all the time that AMD has great open source drivers, but their latest drivers on their 5xx line card couldn’t run my 4K display at 60hz over Display Port without splitting the screen into two separate X displays. Nvidia’s proprietary driver can handle it no problem.

Needless to say I have an AMD card, with awesome open source drivers, sitting in a bin. While the horrid binary-blob Nvidia actually drives my display.

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That's a curious situation. I run my 4k displays over DisplayPort with an RX 580 on Ubuntu 18.04. However, I haven't gone out of my way to obtain drivers from AMD. I'm just using the drivers that ship with the kernel. It might be worth trying a vanilla installation of Ubuntu to see if you can get your set up working.

I did try both the kernel open source drivers and AMD’s pro edition.

Most likely you aren’t using Display Port 1.2 MST, which is what the Dell UP3214Q requires for 60hz 4K.

My testing was with vanilla Ubuntu 18.04.

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