9. Sample XF86Config Files

My current XF86Config File :

Section "Module"
    Load        "dbe"   # Double buffer extension
    SubSection  "extmod"
      Option    "omit xfree86-dga"   # don't initialise the DGA extension
    EndSubSection
    Load        "type1"
    Load        "freetype"
# This loads the GLX module
#    Load       "glx"
EndSection

Section "Files"
    RgbPath     "/usr/X11R6/lib/X11/rgb"
    FontPath   "/usr/X11R6/lib/X11/fonts/local/"
    FontPath   "/usr/X11R6/lib/X11/fonts/misc/"
    FontPath   "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
    FontPath   "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
    FontPath   "/usr/X11R6/lib/X11/fonts/Type1/"
    FontPath   "/usr/X11R6/lib/X11/fonts/Speedo/"
    FontPath   "/usr/X11R6/lib/X11/fonts/75dpi/"
    FontPath   "/usr/X11R6/lib/X11/fonts/100dpi/"
# The module search path.  The default path is shown here.
#    ModulePath "/usr/X11R6/lib/modules"
EndSection

Section "ServerFlags"

EndSection

Section "InputDevice"
    Identifier  "Keyboard1"
    Driver      "Keyboard"
    Option "AutoRepeat" "500 30"
    Option "XkbRules"   "xfree86"
    Option "XkbModel"   "pc101"
    Option "XkbLayout"  "us"
EndSection

Section "InputDevice"
    Identifier  "Mouse1"
    Driver      "mouse"
    Option "Protocol"    "PS/2"
    Option "Device"      "/dev/psaux"
EndSection

Section "Monitor"
    Identifier  "Mini"
    HorizSync   31.5
    VertRefresh 50-90
EndSection

Section "Monitor"
    Identifier  "Impression"
    HorizSync   31.5 - 82.0
    VertRefresh 50-100
EndSection

# Video Card #1, Matrox Millenium II PCI Video Card
Section "Device"
    Identifier  "Matrox"
    Driver      "mga"
    VideoRam 8192
    BusID      "PCI:0:12:0"
EndSection

# Video Card # 2, Fire GL 1000 AGP video card.
Section "Device"
    Identifier  "FireGL"
    Driver      "glint"
    #VideoRam    8192
    BusID      "PCI:1:0:0"

EndSection

Section "Screen"
    Identifier  "Screen 2"
    Device      "FireGL"
    Monitor     "Impression"
    DefaultDepth 16

    Subsection "Display"
        Depth       16
        Modes       "1280x1024" "640x480"
        ViewPort    0 0
    EndSubsection
EndSection

# My Miniature monitor,  notice that I used the virtual option so it is
#   the same heighth as the larger monitor,  this is not necessary.
Section "Screen"
    Identifier  "Screen 1"
    Device      "Matrox"
    Monitor     "Mini"
    DefaultDepth 16

    Subsection "Display"
        Depth       16
        Modes       "640x480"
        ViewPort    0 0
        Virtual     640 1024
    EndSubsection
EndSection

Section "ServerLayout"
    Identifier  "Simple Layout"
    Screen "Screen 2"  
    Screen "Screen 1" Rightof "Screen 2" 
    InputDevice "Mouse1" "CorePointer"
    InputDevice "Keyboard1" "CoreKeyboard"
EndSection

An alternate ServerLayout Section with one Monitor above the other.

Section "ServerLayout"
    Identifier  "Simple Layout"
    Screen "Screen 2"
    Screen "Screen 1" Below "Screen 2"
    InputDevice "Mouse1" "CorePointer"
    InputDevice "Keyboard1" "CoreKeyboard"
EndSection

Screens can overlap too. In this configuration I make the two monitors overlap by 80 pixels..

Section "ServerLayout"
    Identifier  "Simple Layout"
    Screen "Screen 2"
    Screen "Screen 1" Relative "Screen 2" 1200 0
    InputDevice "Mouse1" "CorePointer"
    InputDevice "Keyboard1" "CoreKeyboard"
EndSection