At commit ports 324e88dfe426, graphics/drm-kmod switches from graphics/drm-61-kmod to graphics/drm-66-kmod for OSVERSION 1500031 and later.
Chase the change not to mixup LinuxKPI 6.1 and 6.6 within graphics/drm-kmod and graphics/nvidia-drm-kmod[-devel] on 15.0 and later.
Woud needed to be merged into 2025Q4, too. So ask portmgr for approval, in case this is not covered by blanket approval.