Version: (using KDE 4.2.1) OS: Linux Installed from: Debian testing/unstable Packages When the system clock changes (either from systemsettings or from the command line or when ntpd changes it) while kwin is running, kwin shuts down composite effects and it popups a notification saying that the system is too slow to display effects. After that, kwin needs restarting to display effects again (just reconfiguring it doesn't do anything). This doesn't seem right... :) Steps to reproduce: 1) enable composite effects 2) go to "systemsettings->date & time" and change the time (even just a minute before or after the current time).
*** This bug has been marked as a duplicate of bug 184607 ***