Brightness control does not working on windows 8.1

Before upgrading to Windows 8.1, I install Windows 8 64 bit with driver and tools in the following list: and windows 8 work properly, including brightness control.

After I upgraded to Windows 8.1 with the same driver of Windows 8, Windows 8.1 brightness control does not working. I installed Windows 8 drivers for Windows 8.1 because Windows 8.1 driver is not yet complete on the web.

Drivers have been updated, but still does not working.

Specifications my notebook : Asus K45DR A8-4500M Processsor, AMD Radeon® Mobility™ HD7640G + HD 7470M Dual Graphics with 1GB DDR3 VRAM

This problem is very annoying me Please help to fix the brightness control on windows 8.1 64 bit

I got this from Asus Customer Service Team :
1. Go to Registry Editor (regedit.exe)
2. Go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001
3. Next, go find the KMD_EnableBrightnesslf2 & KMD_EnableBrightnessInterface2 key
4. Set both to 0.
5. Reboot.

Thanks, it work :)

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Question Info

Last updated March 20, 2021 Views 38,047 Applies to: