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Using igpu(AMD 5600g) for screen display and dgpu(Nvidia RTX 3090) for CUDA on ubuntu 20.04

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I am using Ubuntu 20.04.
I have an APU (AMD 5600g) and a Nvidia graphics card (RTX 3090).
I want to use the nvidia gpu only for overclocking and cuda and other heavy works while the igpu takes the screen display、UI and media things.
However, even the nvidia card is not connected to the monitor, The nvidia gpu usage is not 0%. I am confused. Is there any method to use the 2 gpu seperately like on Windows?

Ubuntu Version: 20.04.
Kernel Version: 5.11.0-40-generic.
Nvidia Driver Version: 495.44.
CUDA Version: 11.5

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