Here too. It started with Dapper and KDE 3.5.5. I then did a fresh install of Edgy and the same issue. I'm using the fglrx driver with XGL and Beryl. Here's my hardware database ID: a9be429252117c76110ea3fb6b5a0ab5 -- ksmserver crashes on logout w/ Xgl as session https://launchpad.net/bugs/67809