The automatic brightness adjustment is a sort of override for the manual controls on the home screen. It is not something that is scheduled. It is something that is enabled or disabled at all times. Its supposed to limit at max brightness and a minimum brightness that can be dialed in on the home screen. Although in practice is is either a bit counter intuitive or doesn't work all that well. I'd say it needs some firmware tweaking revising. I've gotten it to do some things like force a dim display or force a middle brightness or a force a full brightness but how I got it to do that an how the settings made any sense was not intuitive and it was more like trial and error even when you accomplish it, you still are left scratching your head trying to make sense of it. After messing it with for a while I just decided to ignore this feature. Even if it worked as I think it was intended to, I still think I would not use it.
The automatic turn on/off of the backlight does work well based on the times you set. That feature I do use to maybe save the screen. If you enable this feature and the screen is ever off you can hit any button and it will turn on the screen, but it won't invoke whatever that button normally does...it just turns on the screen. The screen will then stay on for exactly 1 minute and then turn back off....until the scheduled time is reached. If you turn off the backlight during the turn on period it will remain off until the next turn on scheduled time. If you turn it the backlight off and you have not enabled the automatic backlight feature then the display will permanently stay off until you turn it back on or there is a power outage (or you manually power cylcle).
