Also available via Bug295519 (actually the same patch).
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295519

Anyone having issues with graphics/nvidia-drm-66-kmod{-580|-devel} or previous version (at DRM6.9) of graphics/nvidia-drm-latest-kmod{-580|-devel} and not hesitating to build ports locally can try my above-mentioned patch if you're on 15.1{-BETA*|-RC*} or upcoming -RELEASE, or recent enough stable/15 and main.

Note that, as graphics/drm-612-kmod and graphics/drm-latest-kmod bumped to DRM6.12 are NOT available on 2026Q2 quarterly, NVIDIA counterparts shouldn't appear on 2026Q2 even after the patch lands onto main (aka latest) branch (would appear on upcoming 2026Q3).