https://bugs.freedesktop.org/show_bug.cgi?id=84944
--- Comment #3 from warpme@o2.pl --- It is seen in upper part of screen as classical division between to parts of content shifted horizontally.
This picture looks almost exactly like issue I'm experiencing: http://en.wikipedia.org/wiki/Screen_tearing#mediaviewer/File:Tearing_(simula...
Difference is that tearing line is in upper part of screen (approx at 20% of screen height) br