So you’re trying to mix AMD and Intel and nVidia.
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You can easily mix:
- Intel-nVidia
- Intel-AMD
Choose which one and remove the other.
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There is a way of using all 3 to run displays without you getting involved into programming, but you’ll have to run multiple X servers which has its own drawbacks. (It’ll feel like you’re running 2 computers inside one computer)
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What most people would do is use Intel-AMD to run the display and use the nVidia for CUDA, but if I understand you correctly, you want all video cards to run displays.
Why is this, you ask?
Well, that’s because most people don’t have a rig like yours, and Linux gets built by people building stuff for themselves ¹, so unless you have a developer background and create an Intel-AMD-nVidia hybrid graphics driver yourself, no one else is going to do that for you ².
Note 1: Please read this, especially the “Linux is a self-help OS” section as it applies to your specific use-case.
Note 2: Or more probably someone is already working on that, but as I don’t know anyone here on the forum running like that, I’ve never looked into it and don’t know about it… 