I think it depends on what power saving utilities the manufacturer provides. Most laptops I see you have to manually adjust the brightness and a few have different levels depeding on what power mode you are using. Toshiba allows you to customize the brightness level depending on the battery remaining. That said, I have seen a couple Toshiba laptops, I don't remember it they were specific models or what models they were, that the dimmed after some inactivity and got brighter after moving the mouse or using the keyboard. I have never seen settings for that feature before, but then I don't usually pay attention to the software setup on the laptops that I see.