Also normal user switching from GUI triggers the bug:

Preparations:
===========
1. Plug in external monitor to your laptop (bug does not trigger with single 
display setup)
2. Adjust your display settings (from the preferences menu) so that the image 
is displayed only on the external monitor OR on the laptop screen, but NOT on 
both
3. Do not close your laptop lid, closing it prevents the bug from triggering 
(since login screen is not presented on multiple monitors)

Steps to reproduce:
================
1. Reboot (or shut down and power on)
- at this point the login screen should be displayed on both monitors
2. Log in
- at this point only external OR only interal monitor should be displaying image
3. from "Indicator Applet Session" -> Switch From account...
- login screen is presented, your account should be marked with a green 
checkmark and "logged in" text
- this screen should be displayed on both monitors
4. Click your account and enter password
EXPECTED RESULT: you get back to your already active desktop session
ACTUAL RESULT: X crashes, new login screen is presented displaying that nobody 
is logged in

- to reproduce again, you must reboot

So no using keyboard is needed to switch between VT:s. Bug triggers in
very ordinary multiuser situations.

Tested with two different up to date, clean installed, encrypted Lucid
laptops having Intel GMA 950 display adapter.

-- 
xorg crashes after switching from tty7 -> tty1 -> tty7
https://bugs.launchpad.net/bugs/558596
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