- Adds VIRTUAL1 as permanent primary output via modesetting driver
- HDMI1 set as clone (--same-as) of VIRTUAL1
- hdmi-fallback.sh script monitors drm connector status
- systemd user unit auto-creates VIRTUAL1 and switches on hotplug loss
- Xorg fallback guarantees 1920x1080 framebuffer without HDMI
- Includes xserver-xorg-video-dummy as backup driver
