I just bought a new laptop and there is something that's been annoying me, when am using the laptop with the battery only the screen brightness lower itself automatically, but the problem is that the maximum value of screen brightness also change, on my Acer Aspire the brightness decrease itself too, but i am able to increase it if i want and use the laptop just like the charger is plugged, in the case of Packard Bell i can't, i tried using the FN+Brightness buttons and also tried changing it from windows7 settings, any help please ?
Thank you
