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Mint 22 won't suspend automatically
(sopuli.xyz)
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That seems like a policy kit issue. Maybe the system doesn't have the permissions to do it automatically. XFce usually has such problems in other distros, but I haven't heard one on mint with cinnamon.
Another thing to look at is what graphics card you're using. With nvidia you can get some weird suspend issues.
Finally, install a newer kernel to see if that fixes the issue.
i have tried new and old kernels, liquorix and xanmod too, no help. i am using nvidia gpu though, this has been my fear... maybe I'll go back to mint 21.3 as it didn't suffer from this.