I have tried several times on both of my new pc's and I have no brightness control (or freezes at the dimest setting) after i do the dec 18th update......Have 2 new lenovo ideapad 500 laptops 1 month old.(windows 8) .Works fine until i update the driver,then no brightness control,or you can move it dimmer and it just sticks there at the dimmest setting.....Had to rollback to previous driver.
Tried on each of the laptops multiple times but it still will not work...Obviously an issue with the update?
I recommend using the latest graphics drivers Lenovo provides in their website. You can download it from this link http://support.lenovo.com/en_US/downloads/default.page?selector=expand
The drives Lenovo provide in their website have been validated for your specific computer model. The drivers we have in our website are generic so; our drives may or may not work properly in your system.