After this whole patching with vsync on/off open gl whatever still no change here? Seems sad to me ;_(

I was aber to narrow down the problem.

Having 2 Monitors activated (1 primary and 1 extended) causes screen tearing in fullscreen mode. Doesn't matter if vsync is enabled or not.

I got screen tearing!!!!! - vsync enabled - fullscreen enabled - monitor 1 prefered (2 monitor setup, 2nd monitor on onboard gpu, 1first primary monitor on radeon RX290) - vsync enforced on amd radeon control panel thing .. still tearing Fullscreen is without tearing but not the real "immersive...