Comment 6 for bug 1481813

I found Ubuntu MAAS can’t recognize Lenovo SystemX BIOS working mode correctly.
MAAS takes it as Legacy mode even if I set the BIOS to UEFI mode.
Then it can’t create the ESP and cause the deploy error. Following information is the error message in log file.
Mar 30 10:36:25 real-tick cloud-init[3578]:: System not running in EFI mode, not installing to EFI system partition.
Mar 30 10:36:25 real-tick cloud-init[3578]: efibootmgr: EFI variables are not supported on this system.
You can check detail information in the attached messages log.
I wonder how did MAAS server check if the server working in UEFI/Legacy mode.
Does it depend on a variable provide by BIOS firmware? Or something else.
Please help provide the information about the mechanism of MAAS to check BIOS working mode (UEFI/Legacy).