https://www.nvidia.com/en-us/drivers/details/267226/

But patch to upgrade #FreeBSD #ports are now #pending to be submitted until temporary workaround or fixed version for build issues of graphics/drm-61-kmod and graphics/drm-66-kmod reported as Bug 294870 and Bug 294875 is committed.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294870

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294875

Upstream seems to be working on "real fixes", but maybe need some more time to finish. So I've attached a patch for workaround both for Bug 294870 and Bug 294875 at Bug 294870 already (not tested on any branch other than stable/15, though).