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


Question Info

Last updated March 28, 2019 Views 37,046 Applies to:
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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