Re: Brightness control not working with nVidia driver
I have some additional information that might be useful... I have two identical laptops (same vendor and model, same video card, memory etc.). The brightness control works on one but not the other. The only difference between them is that one (where brightness control doesn't work) is running dual head.
I don't know if this is a known case or not, but I thought it might be useful for tracking down the cause if not. The two nvidia bug reports are attached.