Sounds like you need a slightly newer kernel.
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1873052/comments/15
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** No longer affects: mutter (Ubuntu)
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https://bugs.launchpad.net/bugs/1950428
Title:
Extra frozen / stuck mouse cursor after screen lock / sleep without
fractional scaling
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