Hi Kieran,
thanks for chiming in.
There are a couple of links I posted with information about my system and the systemd journal during the death-loop. Also there is a description there how to reproduce it - at least on my laptop. The distribution doesn’t matter as I can easily reproduce it with Fedora 40, Debian stable and Archlinux.
The process for me is always the same:
Install a base system with Gnome (for convenience)
Add mem_sleep_default=deep via grub to the commandline
put the laptop to sleep via powerbutton
It goes to sleep but is not waking up anymore with the effect I have outlined here: Sleep issues after 3.19 BIOS update - 11th Gen Intel Framework 13 - #28 by lvdd
The point here is that this happened after I upgraded the BIOS from 3.17 to 3.20. All of the above was working fine before. Which lets me believe that this is not an issue with Linux Kernel changes but something being introduced with the BIOS.
If I could somehow go back to 3.17 I would do that and never touch BIOS again.