Read the statement by Michael Teeuw here.
Official RPI Touchscreen, control screen blanking without disabling it
The official Raspberry Pi touchscreen activates a screensaver without documented settings. The screen wakes up when touched. Generally, I would like to keep it that way but I also want to be able to wake up the screen programmatically. If possible, I would also like to tweak the activation time.
I know how to turn the backlight on and off and how to dim the screen but does anyone know how to manage this screensaver?