I have an asus laptop and i have a problem with increase and decreasing level of brightness. help me plz.
my operating system is windows 8.1 and i download and INSTALLED latest version of driver that is compatible with my OS. when i early installed windows, i installed drivers and don't have problem with it. but now after months SUDDENLY it happened to me.Where were the drivers from ? ?They were Official drivers from asus support website.i can see OSD that changing brightness, but i don't actually see any changeI suggest try to press and hold fn KEY in your keyboard. Your laptop brightness will decrease or increase by pressing function key. If nothing happen, then I guess the problem is on your hardware.Did the OP give the model # of the laptop?
Is it under warranty?
How old is the battery?
A failing hardware component can cause that to happen. Most often the battery or the power block.

Also, a poor connection to the AC mains does that very thing, make the brightness go up and down.