What DE are you using? I noticed that under XFCE, I have to use the display-managed suspend option, rather than the "system-managed" one (not sure why there's a distinction).
this post was submitted on 13 Jan 2025
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i use cinnamon. and every suspend option works when done manually in terminal or gui.
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.
Do you have steam running? Lately it's been blocking sleep after even just sitting in the tray for me. This is on arch kde.
i have absolutely nothing running and this still happens. even tried uninstalling every program one by one and seeing if it still happens. it still happens.