[Bug 164242] New: TwinView: Second screen not detected

[Elad Lahav]

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http://bugs.kde.org/show_bug.cgi?id=164242         
           Summary: TwinView: Second screen not detected
           Product: plasma
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: panel-devel kde org
        ReportedBy: elad_lahav users sourceforge net


Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          GCC 4.3.0 
OS:                Linux

Two screens connected to the same video card, using Nvidia's TwinView.
The second screen is not detected on startup, so no desktop is drawn on that screen (though the mouse cursor shows up as usual). Plasma debug output on startup confirms that it only detects a single screen.
This setup works perfectly with both KDE 3.5.9 and WindowMaker. Moreover, a simple Qt4 application that checks the number of screens (QApplication::desktop()->numScreens()) reports two screens when run from startx.

The xorg.conf file:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildmeister builder3)  Wed Sep 12 14:30:30 PDT 2007

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildmeister builder3)  Wed Sep 12 14:29:35 PDT 2007

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 1280 0
    Screen      1  "Screen1" LeftOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
    RgbPath         "/usr/X11R6/lib/X11/rgb"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    #Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "ServerFlags"
    Option         "Xinerama" "0"
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         "keyboard"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "LG L206W"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Samsung SyncMaster"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
EndSection

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

Section "Device"
    Identifier     "Videocard0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 6150 LE"
    Option         "UseDisplayDevice" "DFP"
    Option         "UseEdidDpi" "FALSE"
    BusID          "PCI:0:5:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Videocard1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 6150 LE"
    Option         "UseDisplayDevice" "CRT"
    Option         "UseEdidDpi" "FALSE"
    BusID          "PCI:0:5:0"
    Screen          1
EndSection

Section "Screen"

# Removed Option "metamodes" "CRT: nvidia-auto-select +0+0"
# Removed Option "metamodes" "CRT: 1280x1024_75 +0+0; CRT: nvidia-auto-select +0+0"
    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP: 1680x1050 +0+0; DFP: 1280x1024_75 +0+0; DFP: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"

# Removed Option "metamodes" "DFP: 1680x1050 +0+0"
# Removed Option "metamodes" "CRT: 1280x1024_75 +0+0"
    Identifier     "Screen1"
    Device         "Videocard1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "CRT: 1280x1024_60 +0+0; CRT: 1280x1024_75 +0+0"
    Option         "RandRRotation" "true"
EndSection