Comment # 10 on bug 967590 from Michael Chang

(In reply to Mike Galbraith from comment #9)

> How do I accomplish that?

I think this would work to change the boot order.

 efibootmgr --bootorder "0001,0006,0000"

Also you could try renaming 

 /boot/efi/EFI/grub

to something else like /boot/efi/EFI/grub.save
, then it would fallback to next entry in the order list.

And in the booted system, you could check the BootCurrent from efibootmgr
output to know from where actually booted. 

> They're identical (and attached).

Yes, that meets my expectation as the system was actually booted from
"grub-secureboot", not "opensuse-secureboot" that was set-up later.

Thanks.