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.txt
journalctl -b0 > journal.txt
and attach the resulting text files here.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Tags added: aspeed
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https://bugs.launchpad.net/bugs/2068873
Title:
gnome-shell using more than 50% of CPU by simply moving the mouse
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