The Brightness slider on my CrystalSky 7.85 HB has very little impact - I watched a video where the guy slid the slider to the left and the screen went almost completely black - mine just barely drops a few shades and is still completely readable. Doesn't matter if I disable the auto brightness feature... I'm not really worried about blanking the screen - I just want to be sure I am at max brightness... Anything I'm missing?