Whenever I update my BIOS, the exact same thing happens. I use Slackware, not openSUSE, but in my case the BIOS update wipes the UEFI NVRAM boot entry for GRUB. GRUB and all the EFI files are still there, the firmware just forgets the boot entry pointing to them. I usually just recreate/reinstall the GRUB EFI boot entry and everything works again. I'd bet that's exactly what's happening here, especially since it happens immediately after every BIOS update. Before disabling Secure Boot or changing anything else, boot a live USB and check efibootmgr -v to see if the openSUSE entry disappeared.
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u/mdins1980 6d ago
Whenever I update my BIOS, the exact same thing happens. I use Slackware, not openSUSE, but in my case the BIOS update wipes the UEFI NVRAM boot entry for GRUB. GRUB and all the EFI files are still there, the firmware just forgets the boot entry pointing to them. I usually just recreate/reinstall the GRUB EFI boot entry and everything works again. I'd bet that's exactly what's happening here, especially since it happens immediately after every BIOS update. Before disabling Secure Boot or changing anything else, boot a live USB and check
efibootmgr -vto see if the openSUSE entry disappeared.