It turns out things are even worse than I originally stated for xrandr under KMS. The only thing xrandr appears to be able to do is to set every output to default mode, and arrange them horizontally. It's not possible to disable an output (xrandr --output VGA --off), or to change modes (xrandr --output VGA --mode 640x480); those commands have no effect at all.
It turns out things are even worse than I originally stated for xrandr under KMS. The only thing xrandr appears to be able to do is to set every output to default mode, and arrange them horizontally. It's not possible to disable an output (xrandr --output VGA --off), or to change modes (xrandr --output VGA --mode 640x480); those commands have no effect at all.