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  • Registered: ‎02-02-2019
  • Location: Poland
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W520 LCD backlight is constantly on with external monitor

2019-02-02, 16:28 PM

I'm using W520 with external monitor connected to VGA as my main monitor, the ThinkPad LCD is disabled in settings. 

After an unsuccesfull attempt to configure Nvidia drivers on Linux I started up my Windows 7 Pro 64, which worked normally before and noticed, that my LCD backlight is constantly on, even though my external monitor is connected through VGA and set as my only display in settings.

The laptop shows Windows boot animation on internal LCD as allways and when the system starts, the ThinkPad LCD instead of completely turning off dimmers backlight a bit and stays blank. 

Turning on and off the internal LCD by Fn+F7 combination helps, but after reboot problem presists.


After disabling integrated GPU in BIOS everything is normal, it happens only on Nvidia Optimus mode. 


I removed Lninux from my computer, reinstalled Nvidia and Intel drivers on Windows, reinstalled windows, but nothing changed. 



156 Posts


United States of America

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  • Posts: 156
  • Registered: ‎08-02-2018
  • Location: United States of America
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Re: W520 LCD backlight is constantly on with external monitor

2019-02-27, 18:41 PM

Hi askass! Welcome to Community Forums.


Does the issue happen when switching to the external display manually via Windows Key+P > then choose External Display? Try using the stock Optimus Display Driver from https://pcsupport.lenovo.com/us/en/products/LAPTOPS-AND-NETBOOKS/THINKPAD-W-SERIES-LAPTOPS/THINKPAD-W520/downloads/DS014142


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