Public bug reported:

Binary package hint: xserver-xorg-video-intel

On the external monitor (24'', 1900x1200), connected via DVI to a DellLatitude 
D830
(15.4'', 1680 x 1050):

Bugs:
  0)  after booting I see  a KDM login greeter with fonts and icons way tooooo 
big.
       (Monitor does autoscaling).   See 0th.Xorg.0.log
       I assume that the intel driver uses settings of laptop display instead 
the external
       monitor settings.
   1) then after login I can set with krandrtray to 1920x1200, but fonts are 
still too big.
       While pixel number is corrrect  now , the screen dimension (in mm) used 
is still of
       the laptop display  and from the external monitor.   See 1st.Xorg.0.log, 
1st.xrandr.log,
       and 1st.xdpyinfo.log

When I then login the KDM login greeter looks perfect (# of pixels and size) 
and after
login again  and using krandrtray to switch to 1920 everything looks fine:

--- 1st.xdpyinfo.log    2007-08-29 12:05:54.000000000 +0200
+++ 2nd.xdpyinfo.log    2007-08-29 12:14:20.000000000 +0200
@@ -56,8 +56,8 @@
 number of screens:    1

 screen #0:
-  dimensions:    1920x1200 pixels (331x207 millimeters)
-  resolution:    147x147 dots per inch
+  dimensions:    1920x1200 pixels (519x324 millimeters)
+  resolution:    94x94 dots per inch
   depths (7):    24, 1, 4, 8, 15, 16, 32
   root window id:    0x73
   depth of root window:    24 planes

See also 2nd.Xorg.0.log, 2nd.xrandr.log and 2nd.xdpyinfo.log.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Screen dimensions of external monitor not correct on X server startup (intel 
driver)
https://bugs.launchpad.net/bugs/135557
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