Windows 8 and 8.1 Forums


Unable to adjust laptop screen brightness

  1. #1


    Posts : 8
    Windows 8.1 64-bit

    Unable to adjust laptop screen brightness


    First, techincal specs.
    I have a Windows 8.1 Toshiba Satellite L875D-S7332, with a AMD A6-4400M APU processor with integrated graphics. My display adapter, according to device manager, is a AMD Radeon HD 7520G.

    Now, my problem is that I'm unable to adjust the screen brightness of my laptop. I haven't made any recent changes, and I noticed this about a week or so ago(I don't typically change my laptop brightness, so this could have been happening for longer). In the mean time, I've tried rolling back my display drivers, with no success, and also updating to the latest driver set, which has also not worked. I'm not sure where to go from now, does anyone have any ideas to fix this?

      My System SpecsSystem Spec

  2. #2


    Posts : 2,130
    Windows 8.0 x64


    Welcome to the Forums.


    What happens when you try to adjust the brightness? Is there no setting? Setting grayed out? Or you change the setting but nothing happens?

    If it changes for an instant, then reverts to what it was, adaptive brightness may be enabled.
      My System SpecsSystem Spec

  3. #3


    Posts : 8
    Windows 8.1 64-bit


    Quote Originally Posted by MilesAhead View Post
    Welcome to the Forums.


    What happens when you try to adjust the brightness? Is there no setting? Setting grayed out? Or you change the setting but nothing happens?

    If it changes for an instant, then reverts to what it was, adaptive brightness may be enabled.
    I (attempt to) use the function keys on my keyboard, to adjust the brightness, and the slider appears in the top left corner of my screen, but pressing the "down" button along with Fn does not result in any change of the slider. If, while the slider is still visible, I manually change it with my mouse, and move the slider down halfway or so, the screen brightness does not change that way either. If I go to the taskbar, right click the battery, select power options, and change the slider on the new window that appears, that has no effect either.
      My System SpecsSystem Spec

  4. #4


    Posts : 8
    Windows 8.1 64-bit


    I have also tried changing power profiles (high performance, balanced, etc) and adjusting brightness on each of them, and that has not worked.
      My System SpecsSystem Spec

  5. #5


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Any other special Fn keys not working like volume up down?
      My System SpecsSystem Spec

  6. #6


    Posts : 8
    Windows 8.1 64-bit


    Nope, all those work. And as I mentioned before, it's not an issue isolated with Fn keys, no method that I've tried so far (fn keys, power options>adjust brightness, switch power profiles) has worked.

    *edit*

    I don't know if this has anything to do with it, but I automatically installed about 12 windows updates a week or so ago, from what I can tell none of them included driver updates, but who knows.
      My System SpecsSystem Spec

  7. #7


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    OK, on some laptops a utility is needed for the special FN keys to work. If none of them worked I would have gone down that road. Is this a factory OEM install? If yes was it originally 8.0 or 8.1? My ASUS has an A-10 APU and NVidia with 7660M/7670G switchable graphics. I'm running the latest catalyst drivers from AMD, 14.4 I believe.
      My System SpecsSystem Spec

  8. #8


    Posts : 8
    Windows 8.1 64-bit


    Quote Originally Posted by alphanumeric View Post
    OK, on some laptops a utility is needed for the special FN keys to work. If none of them worked I would have gone down that road. Is this a factory OEM install? If yes was it originally 8.0 or 8.1? My ASUS has an A-10 APU and NVidia with 7660M/7670G switchable graphics. I'm running the latest catalyst drivers from AMD, 14.4 I believe.
    The problem isn't only the Fn keys though, and this method has worked previously before. It's only just recently that I noticed that any method I try does not allow me to change the brightness.

    As for your question, I believe it's OEM? Could you please explain what that means, I'm not familiar with the term. Also, my laptop originally ran 8.0, and I updated to 8.1 when it was released, and I could adjust brightness before and after the update, however long ago the release was. This problem only occurred recently, within the past week or so.
      My System SpecsSystem Spec

  9. #9


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    OEM stands for Original Equipment Manufacturer, I was just asking if it was a factory install or did you install it? The upgrade to 8.1 will sometimes break things, but it sounds like it worked fine after the upgrade so it wasn't that. Normally I would recommend installing the driver offered by the laptop manufacturer, especially if that laptop has mixed dual graphics, like Intel/NVidia etc. Yours is all AMD so the AMD driver from AMD should be fine, like it was for me. You could try downloading and installing a driver from here, Download Drivers
      My System SpecsSystem Spec

  10. #10


    Trnava
    Posts : 683
    Win 8.1.1 Pro x64


    Do you have power management driver installed?

    Satellite L875D-S7332 Support | Toshiba

    Select - Drivers and Updates - Power Management - Toshiba eco Utility
      My System SpecsSystem Spec

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