Version: KWin: 4.1.86 (KDE 4.1.86 (KDE 4.2 >= 20081221)) (using Devel) OS: Linux Installed from: Compiled sources When i try to use xrenderer instead of opengl to enable the effects, i got an error that says that it is not enabled in my xorg.conf. But... i was using xrenderer with kde 4.1 and my xorg.conf didn't change.
Try using the checkbox to "Disable functionality checks" in the Advanced tab.
I tried to do as you say, and it says: "Failed to activate desktop effects using the given configuration options. Settings will be reverted to their previous values. Check your X configuration. You may also consider changing advanced options, especially changing the compositing type"
I've tried to disable all the effects, but still keep active the opengl thing, then i disabled functionality check, switched to xrender and worked, and then i enabled again all the effects and they're working like the previous version of kde...
Is this still an issue with KDE 4.2.x?
*** This bug has been marked as a duplicate of bug 174853 ***