6 Replies Latest reply on Sep 20, 2016 9:36 PM by Emmalbailey26

    HD 4000, Window 10, Failing to Control Brightness


      My laptop is Lenovo Z500

      It worked perfectly until upgraded from 8 to Window 10. And all the other functions works very well, but brightness control doesn't work at all.

      I had tried updating driver, uninstalling and reinstalling it, but in vain.

      Some recommended to contact laptop manufacturer. But



      (1) Function keys work fine. Point on the display(control panel) moves when a function key is pressed.

      (2) Controlling brightness on the display control panel doesn't actually change brightness. It never work.

      (3) Installing Microsoft basic driver solves the trouble.


      I'm almost certain graphic driver, not a laptop as whole, is problematic.

      I hope anyone can help me. thanks for your kindness.