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pieis2pi: From what I can tell, the problem comes down to which desktop GUI you are using rather than anything to do with distibution, GPU, or drivers. If you are using a compositing window manager (like gnome) Unity3D doen't use vsync. In order to fix this for Gnome 3, backup and edit


replacing the line


with the line


Then, restart Gnome. For me this has completely solved the vsync problem in Wasteland 2 and Pillars of Eternity (and I imagine any other Unity3D game) with no adverse side effects. As a warning, I have read that disabling unredirecting can negatively impact system performance on graphics intensive games, but haven't noticed any problems.
Gnome REALLY needs to have an easier way to set undirected fullscreen on or off like KDE and even Cinnamon.