Version: (using Devel) Installed from: Compiled sources I have KDE4.2 beta packages from Kubuntu running. When having a second monitor attached the X-server right after start. Alternatively if I have the monitor not attached, then later attach it, the X-server crashes then immediately. I am not sure, if it is correct to report this against KDE. There was a similar bug in KDE4.1.3/Kubuntu intrepid. The X-server crashed after 10s independently if the second monitor is attached. This could be resolved by disabled XRANDR. In this case there is not XRANDR, but KDED which seems to have to do something with it. If I kill KDED before attaching the second monitor, the crash does not happen. So this is the reason why I report it against KDE. If I can provide any more usefull information, please let me know.
*** This bug has been marked as a duplicate of bug 173017 ***