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  • UEFI or MBR booting? If the former, you may not be loading the samsung-laptop module which controls this functionality. Commented Aug 30, 2014 at 23:17
  • I think it is MBR, because in the bios I need to put uefi/efi mixed setup instead of just uefi that is default. But just to be sure, there is any command that can I run to return the booting system mode? Commented Sep 1, 2014 at 3:04
  • 3
    UEFI booted systems will have /sys/firmware/efi present. Commented Sep 1, 2014 at 3:20