Xorg.conf breaks GUI

[kuifje09]

After upgrading Ubuntu 10.04 to 11.10 I had a problem my display was not reconized.Then tried to instal the Nvidia proprietry driver, but it failed.
After a lot of try and error ( to much to tell ), removed all nvidia* and reinstalled Nouveau.
But still having problems.

When I create an xorg.conf, there are a lot of warnings about drivers missing,

(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
WARNING: Error inserting wmi (/lib/modules/3.0.0-31-generic/kernel/drivers/platform/x86/wmi.ko): No such device
WARNING: Error inserting mxm_wmi (/lib/modules/3.0.0-31-generic/kernel/drivers/platform/x86/mxm-wmi.ko): No such device
WARNING: Error inserting i2c_algo_bit (/lib/modules/3.0.0-31-generic/kernel/drivers/i2c/algos/i2c-algo-bit.ko): No such device
WARNING: Error inserting drm (/lib/modules/3.0.0-31-generic/kernel/drivers/gpu/drm/drm.ko): No such device
WARNING: Error inserting drm_kms_helper (/lib/modules/3.0.0-31-generic/kernel/drivers/gpu/drm/drm_kms_helper.ko): No such device
WARNING: Error inserting ttm (/lib/modules/3.0.0-31-generic/kernel/drivers/gpu/drm/ttm/ttm.ko): No such device
FATAL: Error inserting nouveau (/lib/modules/3.0.0-31-generic/kernel/drivers/gpu/drm/nouveau/nouveau.ko): No such device
(EE) [drm] failed to open device
(EE) No devices detected.

As soon I delete/move away the xorg.conf, I get the 1024/768 display back, which is too small and should be 1280/1024.

I read a lot about xrandr and cvt, but can't get it to work.

This is the xorg.conf that I use, but breaks the GUI.

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 280.13 (buildmeister@swio-display-x86-rhel47-05.nvidia.com) Wed Jul 27 17:18:55 PDT 2011

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Samsung"
ModelName "SyncMaster 910MP"
HorizSync 30.0 - 81.0
VertRefresh 43.0 - 75.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nouveau"
VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection

It is an edited previously automatic generated xorg.conf.
I am even not shure if it is used or just interferes with somthing else.

Please , can someone point me to a solution.