If the slight changes to brightness while you are Web browsing or viewing any other dynamic content on the screen bother you, then you should look in your graphics driver settings for a feature that is described as 'power saving' and disable it. We have found this behaviour to be tied to power management settings in graphics drivers, which, when disabled, allow the screen to maintain a constant brightness level. The subtle changes that occur when going from a dark background on the screen to a light coloured background have nothing to do with the 'Adaptive brightness' setting, but instead are a result of graphics driver settings. In that scenario, the brightness changes based on the room lighting. On the left side of this new window, click Choose when to. These pieces of software are great alternatives, especially if you have extremely sensitive eyes. Apart from the above-mentioned methods to dim the laptop screen, there is also some useful software designed to help you. If I go into the brightness settings window the brightness immediately goes back to full brightness (as they are set) without me changing anything. And the same brightness slider will appear in front of you that you can adjust or dim the PC screen. That setting works using the ambient display sensor on a laptop. On the desktop, right click on the little battery icon near the clock. Im using a Dell Inspiron N5110 laptop with Ubuntu 13 and I find that every time I plug the power in to charge, the screen brightness dims.
This behaviour is a dynamic brightness change that is unrelated to the 'Adaptive brightness' setting in Windows. These changes happen automatically after a couple of seconds, and they can also sometimes manifest as noticeable flickering. On a dark background, the screen will dim automatically, while on a bright background it will brighten. On some laptops, you may have noticed a change in brightness as you go from a screen with a dark background to a screen with a bright background.