How to enable desktop effects in KDE

I installed OpenSUSE10.3 with KDE.
ATI drivers is running as following:
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Mobility Radeon X1300
OpenGL version string: 2.1.8304 Release
To test 3D is running well with “fgl_glxgears”.

But when I try to enable desktop effects,there is not any response.
Does anyone know why?

See the documentation on the wiki: Compiz Fusion - openSUSE.

If you are using KDE 4.x and you want to enable KDE desktop effect, then go to Personal Settings -> Desktop Effects.