when using dual screen, the ubuntu screen doesn't appear on the main screen but on the most left screen. However, the user choice screen appear effectively on the main screen.

Binary package hint: gdm

I expected to have the screen logo of ubuntu on my main screen. It appears that this logo is screened on the most left screen. Notes that the screen connexion appears fortunately on the main screen.

Ubuntu 9.10 (updated on 21/10/09)
xorg 7.4
gdm 2.28
GPU : nvidia 7900GS

A part of my xorg.conf :

Section "Monitor"
    Identifier "Monitor0"
    VendorName "Unknown"
    ModelName "ViewSonic VA903-3Series"
    HorizSync 30.0 - 82.0
    VertRefresh 50.0 - 85.0
    Option "DPMS"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BoardName "GeForce Go 7900 GS"
EndSection

Section "Screen"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    Option "TwinView" "1"
    Option "TwinViewXineramaInfoOrder" "DFP-0"
    Option "metamodes" "CRT: nvidia-auto-select +0+0, DFP: nvidia-auto-select +1280+0"
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection

ProblemType: Bug
Architecture: i386
CheckboxSubmission: e335d3116a7771b567bbb1a8dd134518
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Thu Oct 22 11:18:59 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: gdm 2.28.1-0ubuntu1
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: gdm
Uname: Linux 2.6.31-14-generic i686