Debian Squeeze - Problem configuring xserver manually

[lubovit at tphys.physik.uni-tuebingen.de]

Dear colleagues,

we have problems to configure X-server manually on Debian-squeeze.

Starting the xserver without a manually placed /etx/X11/xorg.conf the system
works fine but the screen resolution cannot be put to maximum values within
a the running x-session (gdm3). The video card seems to be installed
properly.

We created a sample xorg.conf with "X -configure" and placed it into
/etc/X11. The we modified it the following way:

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "LG"
        ModelName    "Flatron"
        HorizSync    30.0 - 83.0
        VertRefresh  56.0 - 75.0
        Modeline "1024x768 at 75" 85.52 1024 1056 1376 1408 768 782 792 807
EndSection

taking the specs from the vendors manual. The problem now is that
the xserver won't start and we have black screen.

Best regards, Paulos and Valery (Sysadmins)