[PATCH 7/7] compositor: implement a state machine for display control

[Bill Spitzak]

Tiago Vignatti wrote:
> DISPLAY_ON → DISPLAY_DIM → DISPLAY_SCREENSAVER → DISPLAY_OFF

Won't there be some interest in making the backlight dim *after* the 
screensaver starts? I can imagine the control ui being a bunch of timing 
sliders, which the user can move anywhere. Thus the screen saver can 
start before it dims. The only real rule is that if the user moves 
display off to the left, it does not bother doing the dimming or 
screensaver.

	start dimming: -----|--------
	screensaver:   ----------|---
	display off:   ------------|-

Ignore this if I don't understand what is going on.