The drivers do not turn off the scaling of the GP. The switch switches, the screen blinks, but when you launch the full-screen application, the monitor still displays 1920x1080, although visually the picture has a low resolution. Ie in fact, scaling GP works, despite the position of the switch in the drivers. Once, by turning on / off the DDC / CI monitor option, I managed to turn off GPU Scaling, with the checkmark in the on position. I could not repeat this event.