Working with two monitors

Got dual monitors work simultaneously on my system. As my thinkpad has a radeon 7500 card (or 7000? not sure), I can use MergedFB option in controlling the two monitors with xorg. The result is quite good. My xorg.conf is

Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
ModulePath "/usr/X11R6/lib/modules"
FontPath "/usr/X11R6/lib/X11/fonts/misc/"
FontPath "/usr/X11R6/lib/X11/fonts/TTF/"
FontPath "/usr/X11R6/lib/X11/fonts/Type1/"
FontPath "/usr/X11R6/lib/X11/fonts/TrueType/"
# FontPath "/usr/X11R6/lib/X11/fonts/URW/"
FontPath "/usr/X11R6/lib/X11/fonts/webfonts/"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/"
# FontPath "/usr/X11R6/lib/X11/fonts/100dpi/"
FontPath "/usr/local/Wolfram/Mathematica/5.2/SystemFiles/Fonts/Type1/"
FontPath "/usr/local/Wolfram/Mathematica/5.2/SystemFiles/Fonts/BDF/"
EndSection

Section "Module"
Load "extmod"
Load "glx"
# Load "dri"
Load "dbe"
Load "record"
Load "xtrap"
Load "type1"
Load "freetype"
Load "radeon"
Load "drm"
EndSection

Section "DRI"
Mode 0666
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "keyboard"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/sysmouse"
Option "Buttons" "5"
Option "ZAxisMapping" "4 5"
EndSection


Section "Monitor"
Identifier "MonitorLCD"
VendorName "IBM"
ModelName "Thinkpad"
EndSection

Section "Monitor"
Identifier "MonitorCRT"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection


Section "Device"
Option "AGPMode" "4"
Option "AGPFastWrite" "yes"
Option "EnablePageFlip" "yes"
Option "DDCMode" "yes"
Option "MonitorLayout" "LVDS,CRT"
Option "MergedFB" "True"
Option "CRT2Position" "Rightof"
Identifier "Card0"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "Radeon Mobility M6 LY"
BusID "PCI:1:0:0"
Screen 0
EndSection

Section "Device"
Identifier "Card1"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "Radeon Mobility M6 LY"
BusID "PCI:1:0:1"
Screen 1
EndSection

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "MonitorLCD"
SubSection "Display"
Viewport 0 0
Depth 1
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768"
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "MonitorCRT"
SubSection "Display"
Viewport 0 0
Depth 1
Modes "1280x1024"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
Modes "1280x1024"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
Modes "1280x1024"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
Modes "1280x1024"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1280x1024"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024"
EndSubSection
EndSection

some of the lines may not necessary. As it works, I don't bother to remove those trivial lines.