Package: xserver-xorg Severity: normal When upgrading packages, I saw this in the changelog of gnome-session: gnome-session (2.26.1-2) experimental; urgency=low [...] * 11_dbus_exit.patch: new patch. Don’t exit when the system bus is disconnected. Thanks Sjoerd Simmons for the hint. Sure enough, after upgrading to 2.26.1-3 from latest unstable, restarting dbus no longer causes the server to restart. - Josh Triplett