Is there a way to programmatically control LCD brightness of the screen connected to RPI over HDMI? As far as I could figure there is really no way to achieve this with RPI over HDMI. What about RPI HDMI to LVDS boards? Does this method give this control? There is a board by chalk-elec that mentions this capability yet I would still like to understand if getting this board is my only way of controlling the brightness of the screen.