Brightness control does not working on windows 8.1

Anonymous
2013-11-13T04:09:30+00:00

Before upgrading to Windows 8.1, I install Windows 8 64 bit with driver and tools in the following list: http://www.asus.com/Notebooks_Ultrabooks/K45DR/#support 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

http://www.asus.com/Notebooks_Ultrabooks/K45DR/#specifications

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

Windows for home | Previous Windows versions | Devices and drivers

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Anonymous
2013-11-13T11:21:23+00:00

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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  1. Anonymous
    2015-02-18T17:41:41+00:00

    Push WIN+X to open system menu - choose System then Device Manager, search for your display/monitor, right-click on it - Update driver software - Browse my computer for driver software - Let me pick from a list... - choose Generic PnP Monitorand the brightness control will work again.

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  2. Anonymous
    2013-12-20T18:51:56+00:00

    I have the same notebook, here's how I fix it:

    1. First I installed the lastest AMD Drivers:

    http://fichiers3.touslesdrivers.com/39739/13-12\_mobility\_win7\_win8\_64\_dd\_ccc\_whql.exe

    1. Then I open the Regedit and go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0000
    2. Set KMD_EnableBrightnessInterface2 to 0
    3. Go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0001
    4. Set KMD_EnableBrightnessInterface2 to 0
    5. Restart your computer

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  3. Anonymous
    2014-06-16T20:15:28+00:00

    Thank you so much for this post, I had this issue for months but now everything works perfectly! Simply amazing!! :)

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  4. Anonymous
    2013-11-28T15:51:41+00:00

    Hi,

    Glad to know you fixed the issue. Thank you for sharing the resolution, as this would help other members of the community facing the same issue.

    Please feel free to reply, in case if you need any further assistance or information on this issue.

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