KDE Plasma CPU High Usage After Install Nvidia Driver

My notebook with RTX3060 has this issue after do something I don’t know. OS is Ubuntu 18.04

Everything is ok after first time install RTX3060, there is no high cpu issue, but after install IME(gcin), nomachine and anydesk and do something I don’t remember, plasma high cpu usage issue happened.

Tried to uninstall anydesk, nomachine and gcin, but those actions cannot solve this issue.

but one time, when plasma cpu usage 100%, the nvidia-smi command shows GPU usage 100%, so I think whether if prevent plasma to use nvidia, it might solve this issue temporary ?

Plasma CPU / GPU usage is normal
Plasma CPU / GPU usage is high.

Notebook has intel i915 driver, so, prevent plasma to use GPU can solve this issue.

First modify /usr/share/X11/xorg.conf.d/11-nvidia-prime.conf and replace it with text below


Section "OutputClass"
    Identifier "Nvidia Prime"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "AllowEmptyInitialConfiguration"
    Option "IgnoreDisplayDevices" "CRT"
    # Option "PrimaryGPU" "Yes"
    ModulePath "/x86_64-linux-gnu/nvidia/xorg"

Section "OutputClass"
    Identifier "intel"
    MatchDriver "i915"
    Driver "modesetting"
    Option "PrimaryGPU" "yes"

Protect the file will not be overwrite by gpu-manager

chattr +i /usr/share/X11/xorg.conf.d/11-nvidia-prime.conf

Reboot system and run nvidia-smi, plasma will not use nvidia GPU, so my plasma cpu usage 100% issue disappear.

this solution might not solve all plasma 100% cpu usage issue, but might be one possible solution.

Plasma without GPU

Detail information which can refer to this url How to configure iGPU for xserver and nvidia GPU for CUDA work

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