I have a dual-monitor setup using the proprietary Nvidia drivers. It appears that the correct settings are used when the OS boots (it appears to be fine at the login prompt), but when I login, the settings for my dual montior are reset and the position of the second monitor is incorrect (it should be set to the right of my main monitor).

I removed xorg.conf from the /etc/X11 directory and AFAIK the only one on the system is in /usr/share/X11/xorg.conf.d/12-xorg.conf (I checked /var/log/Xorg.0.log and it says that it is using /usr/share/X11/xorg.conf.d/)

Here are the settings:

# nvidia-settings: X configuration file generated by nvidia-settings

# nvidia-settings:  version 310.14  (buildd@aatxe)  Tue Oct 16 22:21:09 UTC 2012



Section "ServerLayout"

    Identifier     "Layout0"

    Screen         0  "Screen0" 0 0

    InputDevice    "Keyboard0" "CoreKeyboard"

    InputDevice    "Mouse0" "CorePointer"

    Option         "Xinerama" "0"

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"

    # HorizSync source: edid, VertRefresh source: edid

    Identifier     "Monitor0"

    VendorName     "Unknown"

    ModelName      "DELL U2311H"

    HorizSync       30.0 - 83.0

    VertRefresh     56.0 - 76.0

    Option         "DPMS"

EndSection



Section "Device"

    Identifier     "Device0"

    Driver         "nvidia"

    VendorName     "NVIDIA Corporation"

    BoardName      "GeForce 8800 GTS 512"

EndSection



Section "Screen"

    Identifier     "Screen0"

    Device         "Device0"

    Monitor        "Monitor0"

    DefaultDepth    24

    Option         "Stereo" "0"

    Option         "nvidiaXineramaInfoOrder" "DFP-0"

    Option         "MetaModeOrientation" "CRT-1 RightOf DFP-0"

    SubSection     "Display"

    Depth          24

    EndSubSection

EndSection

System info:

• Xubuntu 12.04


• Nvidia proprietary driver version 310.14


• X.Org X Server 1.11.3