[RESPONDED] AMD FW13 has started to reboot when resuming from hibernate (Ubuntu 22.04)

To my knowledge nothing should wipe out your edits to /etc/default/grub (assuming you ran sudo update-grub). But I wonder if maybe you missed that last step. Perhaps your laptop was simply hibernating while this fix was “working”, and then fix stopped working on the next boot ? I don’t actually know if the changes would ever be applied without update-grub though (i.e., how would the fix have worked in the first place without running that final command to rebuild the grub cfg)…