It actually does this while windows is running. I leave my laptop on all the time. When I close the laptop, it goes into standby. I have changed the settings in the display property's, clicked on apply. check the settings, and I'm good to go. Later,after 15 min of inactivity, my screen will go black, and when I check the settings, they are back to 15,30,20 on power options. This is really wearing my ass out!