I have a very simple solution that solved it for me.
I have an Acer Nitro with NVIDIA GeForce GTX 1650. After installing
Ubuntu 22.04, every time I attached an external monitor the Xorg CPU
usage was 25% - 33% even when nothing is running. This happens with
driver 470 and 510.
To fix it - run
[Expired for xserver-xorg-video-amdgpu (Ubuntu) because there has been
no activity for 60 days.]
** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
Status: Incomplete => Expired
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[Expired for nvidia-graphics-drivers-470 (Ubuntu) because there has been
no activity for 60 days.]
** Changed in: nvidia-graphics-drivers-470 (Ubuntu)
Status: Incomplete => Expired
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Thanks for looking so quickly. I'm almost certain the problem will go
away without the nvidia driver because the nouveau driver didn't
recognise the hardware when I booted off the USB installer, so reverse
prime won't work and there will be no external monitor, which is a
completely new problem.
Also your kernel log shows repeated crashes in the Nvidia driver:
WARNING: CPU: 10 PID: 2860 at
/var/lib/dkms/nvidia/470.63.01/build/nvidia-drm/nvidia-drm-drv.c:574
nv_drm_master_set+0x27/0x30 [nvidia_drm]
I would recommend trying uninstalling the Nvidia driver for a brief
while to see if the
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*
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