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[Taleman <tapio.lehtonen@xxxxxx>]

Tried to get a backtrace or crash dump of X, not sure if this is the same situation as above. I started 
  gdb /usr/bin/Xorg 2>&1 | tee /tmp/gdb-Xorg.txt
and got this:

GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/Xorg...Reading symbols from /usr/lib/debug/usr/bin/Xorg...done.
done.
(gdb) start
Temporary breakpoint 1 at 0x8066a17: file ../../dix/main.c, line 138.
Starting program: /usr/bin/Xorg 
[Thread debugging using libthread_db enabled]

Temporary breakpoint 1, main (argc=1, argv=0xbffff894, envp=0xbffff89c) at ../../dix/main.c:138
138	../../dix/main.c: Tiedostoa tai hakemistoa ei ole.
	in ../../dix/main.c
(gdb) cont
Continuing.

X.Org X Server 1.7.6
Release Date: 2010-03-17
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-28-server i686 Ubuntu
Current Operating System: Linux ubuntu-mini 2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 09:00:03 UTC 2010 i686
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.32-26-generic root=UUID=f4e64f03-c036-4091-8ec5-5cdebb7e7717 ro quiet splash
Build Date: 10 November 2010  11:25:26AM
xorg-server 2:1.7.6-2ubuntu7.4 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.16.4
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sun Dec 12 15:00:14 2010
(==) Using config directory: "/usr/lib/X11/xorg.conf.d"
[tcsetpgrp failed in terminal_inferior: Toiminto ei ole sallittu]

Program received signal SIGSEGV, Segmentation fault.
xf86InitViewport (pScr=0x8213f18) at ../../../../hw/xfree86/common/xf86Cursor.c:110
110	../../../../hw/xfree86/common/xf86Cursor.c: Tiedostoa tai hakemistoa ei ole.
	in ../../../../hw/xfree86/common/xf86Cursor.c
(gdb) backtrace full
#0  xf86InitViewport (pScr=0x8213f18) at ../../../../hw/xfree86/common/xf86Cursor.c:110
No locals.
#1  0x080b276c in InitOutput (pScreenInfo=0x81fd7c0, argc=1, argv=0xbffff894)
    at ../../../../hw/xfree86/common/xf86Init.c:867
        i = 1
        j = <value optimized out>
        k = <value optimized out>
        scr_index = 136109180
        modulelist = <value optimized out>
        optionlist = 0x820b8e8
        layout = <value optimized out>
        screenpix24 = <value optimized out>
        pix24 = 3221223296
        pix24From = X_CONFIG
        autoconfig = <value optimized out>
        configured_device = <value optimized out>
#2  0x08066bbb in main (argc=1, argv=0xbffff894, envp=0xbffff89c) at ../../dix/main.c:203
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}
(gdb) quit
A debugging session is active.

        Inferior 1 [process 1695] will be killed.

Quit anyway? (y or n) y

-- 
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which is subscribed to xorg-server in ubuntu.
https://bugs.launchpad.net/bugs/689233

Title:
  Xorg crash when no display attached