Recently on my notebook's brightness stopped working. Pressing FN+F5/F6 shows the Windows 8 brightness slider, and it goes up/down, but doesn't adjust the actual brightness. Changing it manually through the control panel does not help either.
I had updated my display drivers a few days before, so it is possible that the update broke it, but I don't know for sure. I did a driver rollback, and now the problem has changed a little bit. Now, if the slider is on 50%-100%, the actual brightness is 50%. If the slider goes below 50%, the screen goes black.
I just installed the latest display drivers but the problem remains. I have an ASUS PRO64JQ, installed Windows 8 (64-bit) on it. It has an ATI Mobility Radeon HD 5730 Graphics card.
What should I do? Is this a hardware problem or a software problem? Could my adapter/battery be the problem here? I'll try to install an older version of the drivers if someone can tell me where I can find those.