Apparently, though unproven, at 02:54 on Saturday 05 February 2011, Grant did opine thusly:
> >> Yesterday I caught up with portage and updated quite a few packages on > >> a remote workstation. The system hadn't been updated for about a > >> month. The updates included some xorg stuff and some xfce4 stuff. > >> Today when the workstation's user logged in via gdm, she clicked the > >> xfce4 "Migrate Config" option, something weird happened, and she ended > >> up back on the gdm welcome screen. Now whenever she logs is via gdm, > >> the screen immediately goes black and she is routed back to the gdm > >> welcome screen again. When I have grsecurity enabled I get this in > >> dmesg: > >> > >> Segmentation fault occurred at 000068e453633fdc in > >> /usr/bin/Xorg[X:4777] uid/euid:0/0 gid/egid:0/0, parent > >> /usr/sbin/gdm-binary[gdm:4775] uid/euid:0/0 gid/egid:1010/1002 > > > > When you upgraded x.org, did you also rebuild it's drivers? > > I rebuilt nv but not evdev. Could that be responsible for this? I'm > not sure how since the gdm welcome screen comes up and the keyboard > works fine there for username/password input. I only mention it because in my experience I always have weird shit happening when I upgrade xorg-server over a big version number change. And rebuilding everything that underpins xorg always fixes it. Including drivers and mesa. In the old days when xorg was monolithic this never happened, as all the drivers always got rebuilt anyway. Nowadays with xorg sources being modular, we have to be a little more alert. -- alan dot mckinnon at gmail dot com

