Windows 7 Screen not dimming on laptop

[Charles Linquist]

I have a Lenovo G530. Win 7 runs great on it, but there is no provision in the POWER SETTINGS to dim the display while on batteries. The dimming buttons on the keyboard don't work either.

I downloaded and installed all the Lenovo drivers (display, chipset, etc).

Am I missing a driver? If so, which one?