Hi folks, Julien, Brice, thanks for the fast reply, even if I was gone by the time the mails arrived :) But that was luck for me I guess, as otherwise I would have probably "wasted" some time trying to get some not helpful backtraces, but let's see.
It seems X only crashes and drops one back to gdm login if compiz is started after another WM (at least metacity) was run and compiz replaces it. I did create a separate gnome+compiz session for gdm which does set $WINDOW_MANAGER to "compiz" and run gnome-session afterwards. This works! Gnome is started and Compiz is working as it should. I tested it several times with the normal gnome session and this slightly modified session it was always the same. This suggests when metacity is somewhat killed (as it is when compiz replaces it) the complete X session ends. So this is more or less a normal X shutdown, hence no crash indications in Xorg log. So I guess this is rather not a xserver-xorg-video-radeon issue but apart from that right now I don't know what package to blame. I tried running metacity --replace and compiz --replace afterwards in the gnome +compiz session and all worked as expected without a X shutdown. First metacity replaced compiz and then compiz replaced metacity, no issues there. Only when metacity is run automatically in the regular gnome-session first before compiz replaces it the weird "X shutdown" happens. So no idea if the bug is in metacity or some gnome stuff or somewhere else, but at least I don't think it is a user-configuration issue as another guy I talked to on IRC (#debian...@ircnet, Eduard Bloch, kudos to him and some other guy there) has the same issue. So, what do you suggest now? At least I have a completely working solution now, but I guess there is a bug somewhere which should not get along unpunished! ;-) regards Michael -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]

