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Question

The Y470 brightness adjustment is not working properly. It was working fine out of the box. The on-screen-display is stuck at 3 and not going up or down despite changing the brightness.

Answer

Ensure that you only use the official Lenovo drivers. However there is a possibility that a Windows Update was done by Microsoft and the Intel drivers has been updated to their version instead.

 

Do try to do a driver rollback on the video driver to fix this issue.

 

If problem persist after doing a rollback on the video driver, do uninstall previous version of video driver and Lenovo Energy Management reboot and install the Intel Video driver from Lenovo support site and the Lenovo Energy Management driver.

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Comments
epuylon

Attempted this, and did not work.

 

This error occured before, but I was able to roll back drivers and it fixed the problem.

 

HOWEVER

 

after installation of Office 2010, Windows updated, and the Fn+arrow functions ceased to display the screen icons, yet they still alter the brightness.