So far I’ve only noticed this on OpenSUSE and Pop!_OS, not any other distro I’ve tried (which is a lot…but that’s beside the point). But when I reboot my laptop it does a full power cut, and POSTs again instead of just doing a warm reboot (gives me the “hit a key to get firmware menu” but fans keep spinning, no sign of a POST). My laptop is a Lenovo T530 if that matters.
I’ve tried changing the “reboot=” kernel parameters and it doesn’t make a difference, and I tried booting with “mitigations=off” just in case it had something to do with a hardware mitigation (I was grasping at straws), that didn’t do anything either.
Anyway, I realize this isn’t that important of an issue but I’m really curios as to why it is. Just wondering if anyone has any ideas of where to start looking.
More specifically ACPI settings, both in the BIOS and in the OS.
Another interesting try is to see what the following does in a terminal/console, which is what I often prefer to do (It’s a lot faster than any Desktop reboot if you already have a root console open)
BIOS settings haven’t changed from any of the other distros that don’t cause the problem but I could take a look around and see if there’s anything in the OS. Do you know where those setting would be?
If memory serves rebooting from the command line does the same thing, I’ll have to double check. It even occurs from within the installer.