Welcome to Android Central! Do you mean that the screen would turn on when you got a text message, then turn off automatically? Or are you saying that with normal usage, the screen won't turn off after the idle time that you've set?
Do you have Smart Stay on? If it's on, then as long as you're looking at the screen, the screen will stay on.
Is this only happening when you're plugged in? If so, go to Settings>Developer Options, and make sure the "Stay Awake" option isn't checked on.
08-27-2014 06:51 PM