Update: I tried upgrading my system to the latest LTS (24.04). The
problem just got worse. The spikes are now x > 100%.
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Title:
gnome-shell using
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** Attachment added: "drminfo.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2068873/+attachment/5787845/+files/drminfo.txt
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The high CPU looks like it's just because the system is using software
rendering, because there's no GPU. Ideally moving a mouse cursor
shouldn't need a real GPU though, just basic display hardware.
While the high CPU is happening, please run:
sudo apt install drm-info
sudo drm_info > drminfo
