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Solution for Cannot adjust display brightness
The problem is caused by Windows incorrectly identifying the notebook’s screen.
To fix, open the Device Manager, expand ‘Monitors’, select your monitor, right-click it and select Uninstall. Then, click the ‘Scan for Hardware Changes button. You should now be able to adjust the display’s brightness again!
Source
http://windowsforum.com/threads/cant-adjust-display-brightness.5924/#post-242751