Just an update on the hibernate / suspend issues
- Got suggestion from Framework support to switch BIOS settings to optimal defaults - F2 (Enter BIOS) Set-Up, F9 (Optimal Defaults), F10 (Save and exit)
- I also added no_console_suspend to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub (and did update-grub to implement it on kernels)
Then I started to get more informative messages not just black screen and reboot.
See fw16 debian bookworm hibernate not working for lots of details