Created attachment 50338 [details]
xorg.conf - file

Created attachment 50339 [details]
Xorg.0.log - file

Created attachment 50340 [details]
SaX log file

According to google, the correct modeline for the monitor would be:

Modeline "1920x1200" 154.00 1920 1976 2008 2080 1200 1203 1209 1235 +hsync +vsync

what should I do now? edit the xorg manualy?

Sure, you can edit it. :-) 

I was just asking because I don't want to re-edit the file after each update etc...

Is it possible to add the monitor to the sax2-database so the user can properly
select it and/or sax autodetects it?

Sure, it would be possible to add the monitor to the sax2-database, but it 
won't help since no special modelines for monitors are stored. Does this 
modeline help at all? 

replacing the 1920 modeline generated by sax with the one mentioned in #4 works
perfect. :)

what would be necessary to add the monitor to the sax2-db so other users with
that monitor have no such problem(s)?

> what would be necessary to add the monitor to the sax2-db so other users  
> with that monitor have no such problem(s)?  
  
Don't know (if this will be possible). But Marcus should know.  

could you send me the output of the command 
 
   hwinfo --monitor 
 
Thanks 

Created attachment 50450 [details]
hwinfo --monitor output

here's the requested information. However, it does not seem correct (?). I ran
it with init-level 3....

Thanks I added the following monitor to the CDB 
 
+#============================================== 
+# 2405 FPW 
+#---------------------------------------------- 
+DELL:2405 FPW  { 
+ DDC=DELA010 
+ Option=DPMS 
+ Hsync=30-81 
+ Modeline="1920x1200" 154.00 1920 1976 2008 2080 1200 1203 1209 1235 +hsync 
+vsync 
+ Resolution=1920x1200 
+ Vsync=56-76 
+} 
 

thanks! :)