I tried hardy and with the radeon driver, I am able to get the VGA and
DVI both working perfectly. attaching the xorg.conf . this bug can be
closed.

~/XTEST > dpkg -l xserver-xorg-core | grep ii
ii  xserver-xorg-core                          2:1.4.1~git20080131-1ubuntu9     
   Xorg X server - core server
~/XTEST > dpkg -l xserver-xorg-video-ati | grep ii
ii  xserver-xorg-video-ati        1:6.8.0-1                     X.Org X server 
-- ATI display driver

~/XTEST > xrandr 
Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 2560 x 1024
VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm 
x 301mm
   1280x1024      60.0*+   76.0     75.0     71.9     69.8     59.9  
   1152x864       75.0     74.8  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3  
   640x480        75.0     72.8     66.7     60.0  
   720x400        70.1  
DVI-0 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 
376mm x 301mm
   1280x1024      60.0*+   76.0     75.0     71.9     69.8     59.9  
   1152x864       75.0     74.8  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3  
   640x480        75.0     72.8     66.7     60.0  
   720x400        70.1  
LVDS connected (normal left inverted right x axis y axis)
   1280x1024      59.9  
   1280x800       60.0  
   1280x768       60.0  
   1024x768       60.0     59.9  
   800x600        60.3     59.9  
   640x480        59.9     59.4  
S-video disconnected (normal left inverted right x axis y axis)

I could enable the xinerama like setup with:

 xrandr --output DVI-0 --right-of VGA-0


** Attachment added: "working xorg"
   http://launchpadlibrarian.net/14514964/xorg.conf

-- 
Can not use external VGA display (T43 + ATI + VGA)
https://bugs.launchpad.net/bugs/152021
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