High CPU usage has always been a problem for the Nvidia driver. Although
high CPU when no apps are running is new... Do you have any non-Ubuntu
GNOME extensions running that might be updating the screen in ways
you're not noticing? Xorg itself does idle to zero CPU very well so
*something* external is probably triggering it.

** Package changed: xorg-server (Ubuntu) => nvidia-graphics-drivers-470
(Ubuntu)

** Changed in: nvidia-graphics-drivers-470 (Ubuntu)
       Status: New => Incomplete

** Also affects: xserver-xorg-video-amdgpu (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
       Status: New => Incomplete

** Tags added: amdgpu nvidia

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https://bugs.launchpad.net/bugs/1944667

Title:
  High CPU usage in Xorg with NVIDIA reverse prime external monitor

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