Comment # 4 on bug 951962 from Michael Chang

This sounds very unusual to me. The "Error: you need to load the kernel first"
is from linuxefi which failed in loading the kernel image then subsequent
command "initrdefi" reported it. Usually, the reasoning of the failure (to load
the kernel image) should have been logged as well, but from that attached
screenshot in comment#1 I did not see any error message but only the command
itself, which is weird.

These boot configuration from running openSUSE system (booted by refind) could
be useful

1. EFI boot manager
 efibootmgr -v
2. Contents of ESP
 find /boot/efi
3. content of /boot/grub2/grub.cfg
4. content of /boot/efi/EFI/opensuse/grub.cfg

5. And please specify which boot entry in one of efibootmgr -v output is being
used for booting opensuse

> The only thing I have to check is that there is a "boot" folder with a "bootx64.efi" in > the EFI partition of each disk to be able to interchange them when the system is off.  > (I need to worry to do this mainly on Debian. Manjaro and Antergos even create a       > Microsoft folder with bootmgfw.efi.) 

This sounds fishy to me, the EFI/boot/bootx64.efi is default loader path on ESP
and openSUSE wouldn't overwrite it if it exist before installation. 

I think one failure scenario could be that, you exchanged the disk and default
loader was always used for booting the previously installed system, which may
have been erased by newer openSUSE install that wouldn't make it's loader as
default .. 

CC gary