@Tobins, can you please obtain a better stacktrace? To do that you need
to add the ddebs repository. Basically, first add these lines into
/etc/apt/sources.list:

      deb http://ddebs.ubuntu.com jaunty main restricted universe multiverse
      deb http://ddebs.ubuntu.com jaunty-updates main restricted universe 
multiverse 
      deb http://ddebs.ubuntu.com jaunty-security main restricted universe 
multiverse
      deb http://ddebs.ubuntu.com jaunty-proposed main restricted universe 
multiverse

And then just run "sudo apt-get update". How to add ddebs debug symbols 
repository is explained in more detail here:
https://wiki.ubuntu.com/DebuggingProgramCrash

After you have activate the ddebs repository, please install this package:
sudo apt-get install xserver-xorg-video-vesa-dbgsym

Also, while you're add it please install these ones as well:
sudo apt-get install xserver-xorg-core-dbg

Once you got all the debug symbols installed please reproduce the crash
again and then attach /var/log/Xorg.0.log and /var/log/Xorg.0.log.old

This will hopefully give us function names for all the stackframes.

---

For step #2 please use gdb to obtain a backtrace that includes all variables as 
well:
https://wiki.ubuntu.com/X/Backtracing#Backtrace%20with%20gdb

(the easiest way is to connect to this machine using ssh, then attach
gdb to the X process, trigger the bug and finally run "backtrace full").

** Changed in: xserver-xorg-video-vesa (Ubuntu)
       Status: New => Incomplete

-- 
[vesa] "close" button in gnome-display-properties causes SEGV in X server
https://bugs.launchpad.net/bugs/374507
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-vesa in ubuntu.

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