I was searching, but didn't found an obvious way to know if GRUB is using UEFI in the system boot, or the BIOS compatibility mode or a full fledged BIOS. Only Windows methods. Is there something in GRUB or the Kernel boot logs that shows if I'm using UEFI, EFI or BIOS?
Ok, I booted up my UEFI box to check. First clue, near the top of
If you are not, then the following should appear:
Note that you'll have to have the efibootmgr package installed. You can also attempt to list the EFI variables:
Check if you have a
Inside that partition should be the files that UEFI executes to boot.
If using any of these methods the relevant entries doesn't appear, is very likely you are not using UEFI.
If you've booted using the UEFI firmware as opposed to using BIOS firmware then your system should make the EFI NVRAM variables available in:
When booting using a BIOS (or the BIOS emulation mode of UEFI firmware) then these variables aren't available.
In fact, as @Santropedro pointed out, the path
is missing when booting using a BIOS, which is easier to check.