After turning secureboot on a dual boot box with Nvidia card got the usual low res desktop, possibly because I didn’t notice the very brief enroll key option at the next boot, if there was one. I’ve done this before, and the solution was to remove and reinstall the proprietary drivers. It’s working now, but I’m curious if there is a way to re-enroll the key without going through the remove/reinstall rigmarole. Perhaps a mokutil magic spell? 
It is explained in the SDB.
https://en.opensuse.org/SDB:NVIDIA_drivers#Secureboot
Ooh thanks, I missed that!
For future reference (as root):
# mokutil --import /usr/share/nvidia-pubkeys/MOK-nvidia-driver-G0<X>-<driver_version>-<kernel_flavor>.der --root-pw
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