I believe I see the same problem.   Mine occurs when I put "Patton" (the DVD) 
into the
DVD drive when running Sun's virtualbox with windows XP professional inside.
The crash occurs on a second X server, started via ctrl-alt-F3 and
"startx -- :1".

But, in the end, it's X that crashes on Ubuntu 8.04.   I attach the log file.
After the crash, the other X server (ctl-alt-f7) remains OK.   Hitting
ctl-alt-F3 takes you back to the crashed server's console.  Mouse works
on the other (:0, ctl-alt-f7) server, but the :1 server is dead, and terminated.


On the terminal, just before the backtrace, you got some lines which
may be relevant:
"expected keysym, got XF86kbdBrightnessUp: line 72 of pc
SetClientVersion: 0 9
"


$ lsb_release -rd
Description:    Ubuntu 8.04.1
Release:        8.04
$

$ apt-cache policy xserver-xorg-video-intel 
xserver-xorg-video-intel:
  Installed: 2:2.2.1-1ubuntu13.6
  Candidate: 2:2.2.1-1ubuntu13.6
  Version table:
 *** 2:2.2.1-1ubuntu13.6 0
        500 http://gb.archive.ubuntu.com hardy-updates/main Packages
        100 /var/lib/dpkg/status
     2:2.2.1-1ubuntu12 0
        500 http://gb.archive.ubuntu.com hardy/main Packages
W: Duplicate sources.list entry http://packages.medibuntu.org hardy/free 
Packages 
(/var/lib/apt/lists/packages.medibuntu.org_dists_hardy_free_binary-i386_Packages)
W: Duplicate sources.list entry http://packages.medibuntu.org hardy/non-free 
Packages 
(/var/lib/apt/lists/packages.medibuntu.org_dists_hardy_non-free_binary-i386_Packages)
$ 

$ lspci -nn | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation 82865G Integrated 
Graphics Controller [8086:2572] (rev 02)
$ 


** Attachment added: "Xorg.1.log"
   http://launchpadlibrarian.net/16842027/Xorg.1.log

-- 
950G Fatal server error when minimizing window or starting video
https://bugs.launchpad.net/bugs/225519
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