On FreeBSD 12-CURRENT, UEFI or nonUEFI with vt(), the new nVidia GPU BLOB driver beginning with 375.10, now 375.20, fails to load the kernel module "nvidia.ko" with error: loading nvidia-modeset.ko: KLD nvidia-modeset.ko: depends on nvidia - not available or version mismatch linker_load_file: Unsupported file type loading nvidia.ko: link_elf_obj: symbol sc_get_softc undefined linker_load_file: Unsupported file type
Sounds like you removed or otherwise do not have "device sc" from sys/amd64/conf/<KERNEL> You could likely hack that out of NVIDIA-FreeBSD-x86_64-375.20/src/nvidia/nvidia_os.c, it doesn't look like the function is called anywhere. But it's probably easier to just leave sc in your kenel for now.
(In reply to Kevin Bowling from comment #1) Yes, I removed on all boxes supposed to start via UEFI SC from kernel configs to make them "skinny". After I left the option, the most recent 375.26 driver also worked for me. But still the console is garbage on vt() :-( Hope this gets fixed in near future. Thanks, Oliver