Laptop screen backlight doesn't turn off


  1. princerock
    Posts : 1
    Windows 10
       New #1

    Laptop screen backlight doesn't turn off


    Hi, I recently updated my DELL L502X to Windows 10 from Windows 7. All drivers have been installed and Device Manager shows no problem. However I'm seeing a weird issue. I'm using an external monitor (ASUS) through HDMI. I'm setting the display to show on external monitor only. In Windows 7, everything works fine. After the Windows boot logo disappears, laptop screen turns off and external monitor turns on. In Windows 10, however, there is an issue. After boot logo disappears, external monitor turns on, and laptop screen turns off - but not completely. There is no content anymore but the back light is still on. If I switch the display mode to Duplicate or Extend (just to turn on the laptop screen) and switch back to Second Monitor Only, the laptop screen can turn off completely.

    Has anyone seen a problem like this? Both monitors are shown as Generic PnP Monitors in Device Manager. I don't know if this is a driver problem or something related to my laptop. The bottom line is in Windows 7 there is no such a problem.

    Any suggestion or help would be greatly appreciated. Thanks!
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  3. AbAppletic
    Posts : 56
    Windows 10 Pro x64
       New #2

    This is most likely a bug in Windows 10, but it shouldn't cause any harm. Could be that Windows 10's external monitor feature probably has different settings than Windows 7, such as keeping some power in the other screen. Anyways why would you care? Just live your life with the plug in the wall and have fun with Windows 10!
    Have fun!
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