After installing Kubuntu 6.10 I have the problem of not being able to shut down my two computers using the "Turn Off Computer" button in the logout screen. Pressing the latter button leads to the computers login out of KDE but not correctly shutting down. The machines continue running, showing a black screen. However, first ending the session with "End current session" instead of pressing the "Turn Off Computer" button and then shutting down the computer from the KDM login prompt works fine.
Uncommenting the line "TerminateServer=true" in /etc/kde3/kdm/kdmrc did the job for me too. Now I can shut down the computers directly form the KDE logout screen. My graphics cards: ATI 9250 and ATI 8500 LE Graphics card driver: Open Source driver ati -- Lockup problems with both the free xorg ATI driver and the proprietary fglrx driver, using various ATI cards https://launchpad.net/bugs/30447 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs