I had the same problem on my up to date Kubuntu 8.04 Beta. The problem
is that /etc/ati/authatieventsd.sh can't locate a file. It's got the
wrong path.
In /etc/ati/authatieventsd.sh change this line:
XDM_AUTH_MASK=/var/lib/xdm/authdir/authfiles/A$1*
to:
XDM_AUTH_MASK=/var/run/xauth/A$1*
This solved the black screen hanging on logoff for me.
I'm not quite sure what to change if you're using Gnome, but I suspect it's
this line:
GDM_AUTH_FILE=/var/lib/gdm/$1.Xauth
--
[fglrx] freezes upon Logout or Switch user [patch]
https://bugs.launchpad.net/bugs/118605
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