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?
