Jonathan, look's like after fail with nouveau KWin write to kwinrc config option OpenGLIsUnsafe=true.
After that I change driver from nouveau to proprieatry nVidia driver, but this option is still present in config, resulting not allow to enable desktop effects even with nVidia driver.
Jonathan, look's like after fail with nouveau KWin write to kwinrc config option OpenGLIsUnsafe= true.
After that I change driver from nouveau to proprieatry nVidia driver, but this option is still present in config, resulting not allow to enable desktop effects even with nVidia driver.