Ubuntu: Screen is cut in half, when there is movement


I run kubuntu on an small htpc. The PC is connected to my TV via HDMI. Everything is fine until there is some movement. One half of the screen is a little off. Like this: example

The horizontal line, where the latency appears, moves after reboot, but is otherwise stable. I changed the cable, tried a difrent TV without any different result. This happens when I see a video or when the screensaver is playing.

I tried to change the videocodec, but maybe i didn't do it right.

I think, I need mostly some help, to describe my problem, so I can search for a solution.

Please, please, please help me somehow.

Edit: I don't know why you ask me about the flash player. I have this problem, when the screensaver is running, when I play video files like avi and so on and when I play a video game.

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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