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I recently installed Windows 8 Enterprise EVAL on my Lenovo G560 and the screen brightness control stopped working. I tried installing both the video driver from Lenovo's website and the one from NVIDIA. I also reinstalled Energy management but it didn't help. I also updated the BIOS version and reinstalled the monitor driver but nothing changed. Thank you in advance, Lyubomir

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Have you tried compatibility with windows 7? –  poz2k4444 Sep 29 '12 at 18:23
    
Yes, I did but it didn't help. The brightness slider's value changes but the screen stays the same. –  Lyubomir Raykov Sep 29 '12 at 18:38
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Well, I haven't installed W8, but it could happen that the driver doesn't works with the SO, if lenovo doesn't support drivers for W8 and the compatibility doesn't work either, maybe it could be a good idea wait for the official release –  poz2k4444 Sep 29 '12 at 19:06
    
Is the brightness adjusted using a special keyboard combination? It may be a keyboard driver or software of some sort. –  dangowans Sep 30 '12 at 23:43
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2 Answers

The problem has nothing to do with windows 8. As soon as you update your video driver your brightness control is gone. I've got windows 7 and couldn't find a solution on the web. Don't bother writing the Lenovo-Service.

Never ever ever I will ever buy a Lenovo again. Never.

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On the Lenovo forum I was told to delete all occurrences of the key EnableBrightnessControl, using the Register Editor. The keys can be found at;

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4D36E968-E325-11CE-BFC1-08002BE10318}\0000]

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\Class{4D36E968-E325-11CE-BFC1-08002BE10318}\0000]

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4D36E968-E325-11CE-BFC1-08002BE10318}\0000]

This helped me to fix the issue.

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