A big assumption, but I think you use X with a compositor, which will have no tearing as well. Eg gnome and plasma does use compositors by default.
But in case you just have a very fast computer/smallish resolution and don’t notice tearing, try to watch a video in full screen. This basic functionality doesn’t work with native X, without additional tweaking (like hardware level frame syncing, etc)
But in case you just have a very fast computer/smallish resolution and don’t notice tearing, try to watch a video in full screen. This basic functionality doesn’t work with native X, without additional tweaking (like hardware level frame syncing, etc)