Is there more to the story such as you didn't like Windows and installed some other Windows or updated drivers, used a registry cleaner?
I've seen that model and out of the box it was more than 2 levels (a dozen or more?) so what's different from when you got it?
And if it's new and does this, why keep it?
I have a Lenovo G780. I have only two brightness settings. I need help trying to fix this problem. Does anybody have any suggestions?