[PLUG] Tri-head troubles

[Matt Alexander]

I'm trying to get three LCD monitors working together.

The computer is a Compaq Evo somethingorother with a built in Intel 845g
graphics card and a Matrox Millennium G450 DualHead card.

When the system boots up everything goes to the monitor connected to the
845g card.  When X starts then I get dual-head working on the two monitors
connected to the G450, but the monitor on the 845g goes black.  I'm running
xorg 6.8.2 on Fedora Core 4.

lspci shows my graphics cards at:
     00:02.0 VGA compatible controller: Intel Corporation
82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01)
     06:00.0 VGA compatible controller: Matrox Graphics, Inc. G400/G450 (rev
85)

In /var/log/Xorg.0.log, I get:

     (WW) I810: No matching Device section for instance (BusID PCI:0:2:0)
found

Here's my xorg.conf:

Section "ServerLayout"
        Identifier     "Multihead layout"
        Screen      0  "Screen0" 0 0
        Screen      1  "Screen1" RightOf "Screen0"
        Screen      2  "Screen2" LeftOf "Screen0"
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
        Option      "Xinerama" "on"
        Option      "Clone" "off"
EndSection

Section "Files"
        RgbPath      "/usr/X11R6/lib/X11/rgb"
        FontPath     "unix/:7100"
EndSection

Section "Module"
        Load  "dbe"
        Load  "extmod"
        Load  "fbdevhw"
        Load  "record"
        Load  "freetype"
        Load  "type1"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "us"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/input/mice"
        Option      "ZAxisMapping" "4 5"
        Option      "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Dell 1905FP (Analog)"
        HorizSync    30.0 - 81.0
        VertRefresh  56.0 - 76.0
        Option      "dpms"
EndSection

Section "Monitor"
        Identifier   "Monitor1"
        VendorName   "Monitor Vendor"
        ModelName    "Dell E173FP"
        HorizSync    31.0 - 80.0
        VertRefresh  56.0 - 76.0
        Option      "dpms"
EndSection

Section "Monitor"
        Identifier   "Monitor2"
        VendorName   "Monitor Vendor"
        ModelName    "Nec AccuSync LCD7v"
        HorizSync    31.0 - 81.0
        VertRefresh  56.0 - 75.0
        Option      "dpms"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "mga"
        BoardName   "Matrox Millennium G450"
        BusID       "PCI:6:0:0"
        Screen      0
EndSection

Section "Device"
        Identifier  "Videocard1"
        Driver      "mga"
        BoardName   "Matrox Millennium G450"
        BusID       "PCI:6:0:0"
        Screen      1
EndSection

Section "Device"
        Identifier  "Videocard2"
        Driver      "i810"
        BoardName   "Onboard"
        BusID       "PCI:0:0:0"
        Screen      2
        VideoRam                32768
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     16
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes    "1280x1024"
        EndSubSection
EndSection

Section "Screen"
        Identifier "Screen1"
        Device     "Videocard1"
        Monitor    "Monitor1"
        DefaultDepth     16
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes    "1280x1024"
        EndSubSection
EndSection

Section "Screen"
        Identifier "Screen2"
        Device     "Videocard2"
        Monitor    "Monitor2"
        DefaultDepth     16
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes    "1280x1024"
        EndSubSection
EndSection