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      Cannot Adjust Brightness after upgrading to Windows 8.1 - IdeaPad Z400


      After upgrading to Windows 8.1, it is impossible to change the screen brightness with the hotkey (F11 and F12), or even with the slider in settings.

      Affected configurations

      The above symptom may occur on the following systems:
      IdeaPad Z400

      The above symptom may occur under the following operating system:
      Microsoft Windows 8.1



      Method one

      Installing Intel card driver alone may already fix the issue, however, it is recommended to install the drivers stated below to ensure that we address this brightness issue in Windows 8.1.

      1. Please select the Intel or/and Nvidia driver to install according to your machine hardware configuration.
      2. The drivers provided here may not be updated as provided by Windows 8.1 but it works fine.

      Method two

      This also happens when installing TeamViewer as it adds its own monitor driver. To fix it, please take following actions.

      1. Navigate to Start -> Control Panel -> Hardware and Sound -> Device Manager.
      2. In the Device Manager window, look for “Monitors”, then right-click your monitor and select “Uninstall”. Be sure to also check the “Remove driver” option. Once removed, click the “Scan for hardware changes” icon. Doing so should bring the brightness settings back.
      3. For both NVIDIA and Intel drivers, after performing this solution, you can restore the brightness via Windows Mobility Center (Windows+X).


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      • Alias ID: IN20131217-001
      • Document ID: HT080665
      • Last Updated :15 Apr 2016
      • © 2016 Lenovo