AMD dual graphics laptop movie playback

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http://askubuntu.com – Recently I bought an AMD APU based laptop (A6 3420M + Radeon 7670M), installed the proprietary driver (AMD Catalyst) and everything works fine except for movie playback in the fullscreen -- it seems like I have a vertical line appearing every now and then in every video file, regardless of the movie player (appears equally for mplayer and xbmc). My first idea was vertical sync, so I disabled it in the Compiz. My fglrxinfo look as follows: display: :0 screen: 0 OpenGL vendor string: Advanced Micro Devices, Inc. OpenGL renderer string: AMD Radeon HD 7600M Series OpenGL version string: 4.2.11 (HowTos)