I checked again my driver, windows says geforce driver is up to date, but checking date shows it’s not. Windows 10 auto update geforce driver seems to work fine on my surface book, but not for my 2nd notebook. I updated driver by hand shows, yes, really(!), the reason was a older NVIDIA driver!
So, when people come to you or some one else found this thread people talk about “washed out black” or everything is “to bright”, just let them check geforce driver. It seems some older versions do some “gamma kick up” in fullscreen on Full HD, perhaps it was a feature for better watching movies, I don’t know.
After updating driver, I do not recognized the gamma kick in anymore. Not on packaged steam game and not in stand alone game.