Comment # 60 on bug 1175626 from Martin Wilck

(In reply to John Shaw from comment #59)
> Unfortunately I can't really confirm what the exact version was for the
> nVidia update that came through. I tried hunting thoughout the saved
> snapshots, but only succeeded in hanging the yast snapshot tool after
> looking for differences between saved pairs. This is the first time that has
> happened, it may be that there were a LOT of differences in the pair I was
> examining. The current version for the nVidia driver is 450.66, but I doubt
> that  helps much.

You chose quite a complex method to figure this out ;-) 
I'd just run "grep -i nvidia /var/log/zypp/history"; possibly prepend
/.snapshots/$X/snapshot with the snapshot where the problem first occured.

> I finally found compiled efi shell (from the Arch Linux repos) and copied it
> to by UEFI partition. I should be able to get into to from the BIOS. I can
> try to boot the opensusi shim.efi file and see what happens.

Thanks a lot for your cooperation!