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[Heikki Keränen <heikki.a.keranen@xxxxxxxxxx>]

I'am able to reproduce this consistently.

Configuration:
HP laptop nx7400, Intel GMA 950.
HP LP2475w 1920x1200 external display connected to the laptop via VGA1
no xorg.conf, default desktop effects enabled
In my account I have enabled the external display (VGA1) and disabled the laptop display (LVDS1) from graphical preferences dialog. Laptop lid is open all the time. Here is the xrandr output:
---
~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 4096 x 4096
VGA1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm x 352mm
1920x1200 60.0*+ 59.9 
--clip---
LVDS1 connected (normal left inverted right x axis y axis)
1680x1050 60.1 +
--clip--
TV1 disconnected (normal left inverted right x axis y axis)
----

Steps to reproduce:
1. Reboot
2. Type in Luks password (I have encrypted root) (both laptop and external are displaying the same image)
3. Log in (again both laptop and external displaying the same image)
After login only external VGA1 is displaying image.
4. Press: Ctrl+Alt+F1, result: both laptop and external display are displaying the same image
5. Press: Ctrl+Alt+F7, 
EXPECTED result: back to the logged in desktop, 
ACTUAL result: login screen displaying that nobody is logged in anymore
6. Log in. Now the xorg session is at VT8 and the bug cannot be reproduced anymore without reboot.

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