Anespor's suggestion works well.  Add the following two lines to the
"Monitor" section of xorg.conf:

        DisplaySize     <WIDTH in mm> <HEIGHT in mm>
        Option          "Monitor-LVDS" "<Monitor Identifier>"
        # Replace the <...> with your own values

Here is the full "Monitor" section from my updated xorg.conf for your
reference...

Section "Monitor"
        Identifier       "DCLCD"
        Option          "DPMS" "true"
        HorizSync     64.7-65.29
        VertRefresh   59.883-59.954
        DisplaySize   433 271
        Option           "Monitor-LVDS" "DCLCD"
EndSection

** Attachment added: "xorg.conf"
   http://launchpadlibrarian.net/10632880/xorg.conf

-- 
DDC report some ridiculous physical screen size (Mostly on Intel driver, and 
some ATI)
https://bugs.launchpad.net/bugs/151311
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