Partial screen with x.org 6.8 compiled with source from cvs

[Andras Lorincz]

I am having sarge installed and took these steps to compile and install X.org:

 - created directory /usr/src/build
 - in build made lndir ../xc
 - edited xc/config/cf/host.def and added these line at the end:
        #define ProjectRoot /opt/Xorg-6.7.99.1
        #define NothingOutsideProjectRoot YES
        #define DefaultGcc2i386Opt -O0 -g
        #define HasFreetype2 YES
        #define HasFontconfig YES
 - deleted the directory /usr/X11R6
 - mkdir /opt/Xorg-6.8
 - ln -s /opt/Xorg-6.8/ /usr/X11R6/
 - make World
 - make install
 - in xorg.conf file made these changes as compared to XF86Config-4 file:

        Section "InputDevice"
            Identifier  "Keyboard0"
            Driver      "Keyboard"

       to

       Section "InputDevice"
            Identifier  "Keyboard0"
            Driver      "kbd"

and added:

        Section "Extensions"
                Option  "Composite"     "Enable"
        EndSection

Aftyer all this launched "/etc/init.d/gdm start". The server starts
but the desktop occupies just part of the screen, so the desktop
extends from the upper left corner of the monitor to some point in the
middle of the monitor. So I can see everything from the desktop but
everything is smaller. Imagine something like this:

---------------------------------------
|                          |                    |
|                          |                    |
|                          |                    |
|---------------------|                    |
|                                               |
|                                               |
---------------------------------------|

The outer rectangle is the monitor and and the inner is my desktop.
What should I do?