KDE - Desktop effects does not change to OpenGL from XRender
In the Desktop Effects -> Advanced whenever I change the "Compositing type" from XRender to OpenGL, after a screen flicker it changes back to XRender.
OS: Debian Squeeze
KDE version: 4.4.5
GPU : SiS 661/741/760 PCI AGP or 662/761Gx PCIE VGA Adapter
RAM: 1.2 GB
CPU : Intel Core 2 Duo 3 Ghz