It seems to be a real HW issue on my Thinkpad 13. Tried with Windows on this machine - same behavior.
Switched NVME with the Kubuntu 22.10 to another equal Thinkpad 13 and there is all as it should be: Resume from suspend within a second!
BIOS, Intel Management Engine had similar revision. Exchanged also the backup battery without any impact.
It seems to be a real HW issue on my Thinkpad 13. Tried with Windows on this machine - same behavior.
Switched NVME with the Kubuntu 22.10 to another equal Thinkpad 13 and there is all as it should be: Resume from suspend within a second!
BIOS, Intel Management Engine had similar revision. Exchanged also the backup battery without any impact.