OK. Perhaps I misunderstood the options.
Writing this from a 2007 Core2Duo, 2 GB RAM, 2 GB swap, Leap 15.6 KDE.
We still have no proof that the swap is at fault.
Look in the journal about the time of successful and unsuccessful suspend.
You should see something like:
Mar 26 18:18:32 localhost.localdomain kernel: PM: hibernation: Preallocating image memory
Mar 26 18:18:32 localhost.localdomain kernel: PM: hibernation: Allocated 183955 pages for snapshot
Mar 26 18:18:32 localhost.localdomain kernel: PM: hibernation: Allocated 735820 kbytes in 11.59 seconds (63.48 MB/s)
As you can see, this system happily hibernates and resumes using just some 700 MB of swap space for the memory image.
YMMV since Gnome 47 (and 48 on next zypper dup) are known memory hogs.
That may possibly explain why hibernate works when logged out and doesn’t work with a Gnome session active.
But if we cannot see actual data, we cannot tell for sure.
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