So this helped a little.
I installed the ati-version from your link and some most of the graphic 
glitches on the external are gone, but this is what I get with xrandr -q:
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1200
VGA-0 connected 1280x1024+0+0 (normal left inverted right) 338mm x 270mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       75.0  
   1024x768       74.9     75.1     60.0  
   832x624        74.6  
   800x600        75.0     74.9     60.3  
   640x480        75.0     74.8     60.0  
   720x400        70.1  
LVDS connected 1280x800+0+0 (normal left inverted right) 0mm x 0mm
   1280x800       60.0*+   60.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
S-video disconnected (normal left inverted right)

Now I cannot put the external as a big desktop because the maximum size
is too small and after some time like 30 min the system froze completely


** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/9526379/Xorg.0.log

-- 
[gutsy] X crashes when 2nd monitor is attached to Notebook
https://bugs.launchpad.net/bugs/145620
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