Laptop (DELL L502X) Screen Backlight Doesn't Turn Off
Dec 19, 2015
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.
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.
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