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Lagging graphics output

I have a ThinkPad T440s with an "Intel Corporation Haswell-ULT Integrated Graphics Controller" and Fedora 20 running on it. In general it works, but when the graphics output changes rapidly (e.g. scrolling or watching a video) there appear some weird lines for a moment. It looks like a broken image or something with a cut.

I thought the display panel is broken but the same behaviour is observable when connecting my TV over the mini-DisplayPort.

So it may be some driver related issue?!

Someone with suggestions?