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Unable to Increase Brightness - IdeaPad Z500

Symptom

Brightness function keys +/- cannot increase the brightness on display. Other function keys are working properly.

 

Affected configurations

The above symptom may occur to the following systems:
IdeaPad Z500

The above symptom may occur under the following operating system:
Microsoft Windows 7 64-bit

 

Solution

The issue is most likely related to a windows update that has renewed the graphic driver. 

1. Go to device manager

2. Select Display adapters and scroll down

3. Right click on Inter(R) HD Graphics4000 and select properties option

4. Go to tab Drivers in the pop up window

5. Push the Rollback Driver button

6. Wait until it is done. Your system should recover the brightness and the increase/decrease functions in the keyboard.