Everything using OpenGL stutters

For a few days - I surely have changed anything but I don't know what -
everything that uses OpenGL stutters every few seconds, both Video and
Audio. The only exclusions are glxgears and Wine programs using DirectX.
Wine programs that use OpenGL natively have this problem as well. I use
X.Org 7.3 with fglrx 8.542 on Gentoo without any compositing.

Does anyone know that problem or have a hint?

-Erik

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