Windows 8 and 8.1 Forums

Backlight turns off

  1. #1


    Posts : 4
    Windows 8.1

    Backlight turns off


    This is one of the strangest things I have ever seen.
    I have an HP Elitebook 8460p and recently updated my Windows 8 to Windows 8.1.
    Now when I have certain windows open and focused (it's always different, sometimes it's chrome, sometimes it's the control-panel and so on, there is no clear pattern) the backlight of the screen is completely turned off - when I take a torch and point it to the screen or hold it to a bright-light source I can see there is still a picture there you can even work (or better said you cuold if you'd see anything). When I tab to certain other windows the screen goes back to normal back light - I can then tab back to the other window and the backlight will be turned off again.
    I have no idea what's going on and also no idea what information you need. The display-adapter I got is the AMD Radeon HD 6400M - I tried updating to the newest driver but that didn't help.

    Any help is appreciated!

    Here's a video of the whole thing:

    Last edited by Brink; 23 Oct 2013 at 11:31. Reason: embedded video

      My System SpecsSystem Spec

  2. #2


    Posts : 2,191
    Windows 8.1


    It almost sounds like a switchable graphics issue and that would point towards a graphics driver issue in general. So, I did some research and I noticed the latest driver download (directly from AMD) is not compatible with a switchable graphics configuration:

    Click image for larger version

    Moreover, I was really confused when I tried to locate your graphic drivers and I found they were all Intel versions based on your model number.

    Select a product - HP Support Center

    Anyway, good luck in resolving your issue.
      My System SpecsSystem Spec

  3. #3


    Posts : 4
    Windows 8.1


    Hello and thanks for responding.

    I just searched around and found my specs:
    Spezifikationen: HP 8460p - Pro - Home

    So it looks like the card is an AMD Radeon HD 6470M.

    Maybe this helps.
      My System SpecsSystem Spec

  4. #4


    Posts : 2,191
    Windows 8.1


    Quote Originally Posted by tenhouse View Post
    Hello and thanks for responding.

    I just searched around and found my specs:
    Spezifikationen: HP 8460p - Pro - Home

    So it looks like the card is an AMD Radeon HD 6470M.

    Maybe this helps.
    Yes, your reference is quite different than the one I found at the HP site. Anyway, it looks like the switchable graphics is not applicable here so I'm a bit lost as to what to specifically suggest next otther than making sure you are running the latest BIOS and making sure all drivers have been updated in accordance with the manufacturer's recommendations. I also saw some mention about a back-light toggle option and hot key options that you might like to explore as well; however, I'm not sure if you even have those and, if so, how they would be managed. I'd check my owner's manual for any references, and if all else fails, you may end up back at you manufacturer's support group to sort this out. Good luck.
      My System SpecsSystem Spec

  5. #5


    Posts : 4
    Windows 8.1


    Somehow I just found out how it works!

    The problem occurs only if there is too much "white" on the screen. For example if I open paint and make the background black nothign happens, if I change it to white, the backlight is gone.
      My System SpecsSystem Spec

  6. #6


    Posts : 2,191
    Windows 8.1


    Now it really sounds like a driver issue to me! Can you try uninstalling the AMD graphics driver and see if it will run OK on the default Win 8.1 VGA driver? I know things might not look that good but I think this test is necessary.
      My System SpecsSystem Spec

  7. #7


    Posts : 2,191
    Windows 8.1


    Update:

    Alternatively, you can also try this AMD utility to automatically check to make sure you are using the latest recommended driver:

    AMD Driver Autodetect

    You also might want to see if Windows Update lists an "optional" graphic driver download too!

    Good luck.
      My System SpecsSystem Spec

  8. #8


    Posts : 4
    Windows 8.1


    Hi

    I downloaded and installed the AMD-driver for Windows 7 x64 from the official HP site (http://h20565.www2.hp.com/portal/sit...tte.cachetoken), now it looks like it is working again.
      My System SpecsSystem Spec

  9. #9


    Posts : 2,191
    Windows 8.1


    Glad you got it working.
      My System SpecsSystem Spec

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