Version: (using KDE 4.3.1) OS: Linux Installed from: Ubuntu Packages if I enable the kwin desktop effects or if I start compiz, the desktop goes black. when I turn them back off the desktop comes back. when it's on the desktop doesn't come back even if logging out then back in. my computer has working 3d acceleration. a couple of times I got it working kwin acceleration+desktop but I don't remember what I did to make it work. This is ubuntu karmic so it may be because the system is still alpha. my graphics card is ATI r200, free software driver.
this is a driver, GPU and/or x.org configuration issue.