Comment 17 for bug 529230

I've determined some of the things involved on my system when this happens but I don't know if others' situations are the same.

Marc and I have our troublesome X sessions starting on VT1 (tty1). Is that true for other reporters? You can tell right after you see the inital graphic login screen after booting if you hold CTL-ALT and press F1 and the login screen doesn't change. If it does change you can press CTL-ALT and F7 or other Fn keys to go back--in that case your situation is different from Marc's and mine.

The Xorg.0.log.old file after the crash also lists the VT Xon which X started before the crash. I noticed in the file he posted that Marc's session started on VT1.
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Marc and other reporters seeing their graphic login on VT1:
What is the last thing you are seeing on your screen before gdm starts up X and displays the graphic login? (Are you seeing a splash screen, or messages, or a blank screen)? If a blank screen, what was the last thing you saw on the screen before it is cleared?
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Looking at another aspect of this bug:

Do each of you see messages in /var/log/auth.log including text similar to "FAILED LOGIN (3) on '/dev/tty1'" before one of these crashes?