I see this in you XorgLog.gz: (in the EDID information for the VGA
connection)

[ 2810.719131] (II) intel(0): EDID vendor "SAM", prod id 596
[ 2810.719137] (II) intel(0):     EDID quirk: Detailed timing is not preferred, 
use largest mode at 60Hz
[ 2810.719180] (II) intel(0): Not using mode "1680x1050" (width too large for 
virtual size)
[ 2810.719188] (II) intel(0): Not using mode "1680x1050" (width too large for 
virtual size)

So it apparently wants to set the 1680x1050 mode first, but doesn't
because the desktop virtual size is too small. This looks like bug
220563 which was supposed to not be a problem anymore.

If you're having the monitors side-by-side you would need a virtual width of at 
least 1680+1280=2960. Can you try if either of the following works:
1. Add the these lines to the "Screen" section in /etc/X11/xorg.conf:
SubSection "Display"
  Depth 24
  Virtual 3000 1200
EndSubSection
2. In System -> Preferences -> Display, place the external monitor above or 
below laptop monitor. This should  make a virtual height of 1050+800 = 1850, 
which I think it is by default (I think it is 2048x2048).


** Summary changed:

- [jaunty] Incorrectly detects screen resolution of Samsung 225BW
+ [i965] [jaunty] Incorrectly detects screen resolution of Samsung 225BW

** Tags added: 965gm dual-monitor intel jaunty resolution xorg

-- 
[i965] [jaunty] Incorrectly detects screen resolution of Samsung 225BW
https://bugs.launchpad.net/bugs/346611
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