Windows 8 and 8.1 Forums


Can't change laptop brightness on 8, but I can on Win 7

  1. #1


    Posts : 2
    Windows 8.1 Pro x64

    Can't change laptop brightness on 8, but I can on Win 7


    I have an Acer Aspire 8930G with Windows 8.1 x64 and Windows 7 x86 as a dual-boot. I use 8.1 as my everyday OS and only boot into 7 to play older games that only work with a 32-bit OS.

    Ever since I installed Windows 8, I have not been able to adjust the brightness of my screen. Note that this problem started since I installed 8, not 8.1, and before I put on the copy of 7 as a dual-boot. When I use Fn+left/right (the brightness keys on my PC), the brightness slider appears on-screen and goes up and down, but the brightness of the panel doesn't actually change. Using the Charm doesn't help either, nor does adjusting it through the Control Panel.

    I have tried fiddling with my Power Options in the Control Panel and disabling adaptive brightness. I have tried several different driver versions for my GPU, a GeForce 9600M GT. None of this has helped.

    In Windows 7, however, the brightness controls work fine. If I want to adjust my brightness for 8.1, I have to boot into 7, change the brightness there, and then boot back into 8.1, where it will keep whatever brightness setting I was using in 7.

    Does anyone have any ideas on how to fix this? Is there some messed-up thing in the Registry? Is my GPU's firmware maybe just not compatible with Windows 8? I took a look at TechPowerUp's repository of GPU BIOSes, but it appears I already have the most recent one.

      My System SpecsSystem Spec

  2. #2


    UK
    Posts : 333
    Windows Server 2012 R2 / 8.1


    Hello Jxl,
    Found this on the Geforce website:

    https://forums.geforce.com/default/t...-not-working/4

    Not sure if it will help but does not seem like a bad place to start

    Cheers,
    Harry
      My System SpecsSystem Spec

  3. #3


    Posts : 2
    Windows 8.1 Pro x64


    Quote Originally Posted by Harrylowt View Post
    Hello Jxl,
    Found this on the Geforce website:

    https://forums.geforce.com/default/t...-not-working/4

    Not sure if it will help but does not seem like a bad place to start

    Cheers,
    Harry
    Thanks! I followed a link in the thread which contained a registry fix that solved the problem immediately. Here's the page in case anyone else has this issue; check under step 4 for the solution I used.

    Nikhil's Notebook: NVidia Graphics card, display brightness not changing
      My System SpecsSystem Spec

  4. #4


    UK
    Posts : 333
    Windows Server 2012 R2 / 8.1


    Brilliant News glad i could help, enjoy being able to see the screen
      My System SpecsSystem Spec

Can't change laptop brightness on 8, but I can on Win 7
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