Comment 1 for bug 292304

This happens when Xinerama is enabled in xorg.conf...

here is my xorg file...

Section "ServerLayout"
    Identifier "Default Layout"
    Screen 0 "Screen 0" 0 0
    Screen 1 "Screen 1" RightOf "Screen 0"
EndSection

Section "Module"
    Load "glx"
    Load "xtrap"
    Load "xrandr"
EndSection

Section "ServerFlags"
    Option "Xinerama" "1"
EndSection

Section "Monitor"
    Identifier "Monitor0"
    VendorName "ViewSonic"
    ModelName "ViewSonic VP171b"
    HorizSync 30.0 - 82.0
    VertRefresh 50.0 - 85.0
EndSection

Section "Monitor"
    Identifier "Monitor1"
    VendorName "ViewSonic"
    ModelName "ViewSonic VP171b"
    HorizSync 30.0 - 82.0
    VertRefresh 50.0 - 85.0
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BoardName "GeForce 9800 GX2"
    BusID "PCI:4:0:0"
EndSection

Section "Device"
    Identifier "Device1"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BoardName "Quadro NVS 290"
    BusID "PCI:6:0:0"
EndSection

Section "Screen"
    Identifier "Screen 0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    Option "TwinView" "0"
    Option "metamodes" "nvidia-auto-select +0+0"
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection

Section "Screen"
    Identifier "Screen 1"
    Device "Device1"
    Monitor "Monitor1"
    DefaultDepth 24
    Option "TwinView" "0"
    Option "metamodes" "nvidia-auto-select +0+0"
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection