What does KDE Compositor Tearing prevention ("vsync") do under the hood?

I have screen tearing issues. When I set Tearing prevention ("vsync") in Compositor to something else and then back to Automatic the screen tearing is gone. I would like to know what configuration files Tearing prevention ("vsync") changes to troubleshoot this problem and find a permanent fix. I test for screen tearing with this video . I also have screen tearing with the latest live iso with both free and non-free drivers. Operating System: Manjaro Linux KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.70.0 Qt Version: 5.15.0 Kernel Version: 5.6.16-1-MANJARO OS Type: 64-bit Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz Memory: 15,5 GiB of RAM GPU: Nvidia GeForce 940M