Comment # 9 on bug 101229 from Paul

(In reply to Michel Dänzer from comment #8)
> To prevent tearing, you need to either choose OpenGL instead of XRender and
> an appropriate tearing prevention setting, or enable TearFree with
> 
> xrandr --output eDP --set TearFree on

it's less obvious, but there still appears to be screen tearing when running
via openGL 3.1 using full-screen-repaints.

It's also reasonably obvious that for some GUIs their buttons will update their
two triangles across two frames instead of one, this seems to be a much rarer
occurrence with the above settings however.