I have gnome3 in a netbook. In gnome-shell power management defaut configuration (using the battery), my screen goes off after some minutes. For now this is good. But when I back to my netbook and tryed use it, my screen stopped in black. After some time, I discovered I could use the special buttons "increase brightness" and "decrease brightness" to control my screen and back to normal.

I expected my screen normal when I moved my mouse or pressed some keys at keyboard, and not only when I use this buttons. It's annoying because I need press about 4 or 5 times to see my screen normal again. And worse: I can't config the time to let my system do this, isn't good for reading.