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ZBook screen brightness does not work after switching to nvidia graphics

HP Recommended
ZBook 17 G3
Microsoft Windows 10 (64-bit)

Hi all.

Today when starting Sketchup I was reminded that my Zbook has a M4000 Nvidia and not using it. So I enabled it in BIOS, rebooted and... now it's running (hopefully) but the screen brightness control is not working anymore. And that means Fn+F5, Fn+F6 does not make any change, neither does Settings->System->Change Brightness... In both cases the slider moves but the brightness remains the same...

Bright (:-D) advises are welcome !


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