我用的是cent OS的linux ，主板上的显示芯片是intel的852GM，我在xp下设置双显没有问题，可是在linux下修改完/etc/X11/xorg.conf的内容后tv上没有信号输出，crt可以正常显示。
经过本人研究终于解决了问题，现在供大家参考
在图形界面下以root身份登陆，修改/etc/X11/xorg.conf文件，下面是修改后的内容。[code] Section "ServerLayout"
Identifier "Multihead layout"
Screen 0 "Screen0" LeftOf "Screen1"
Screen 1 "Screen1" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
Option "Xinerama" "on"
Option "MonitorLayout" "anystr"
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 "glx"
Load "record"
Load "freetype"
Load "type1"
Load "dri"
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 "SyncMaster"
DisplaySize 320 240
HorizSync 30.0 - 71.0
VertRefresh 50.0 - 160.0
Option "dpms"
Option "MonitorLayout" "CRT,TV"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "LCD Panel 800x600"
HorizSync 31.5 - 37.9
VertRefresh 40.0 - 70.0
Option "MetaModes" "800x600"
Option "TVOutFormat" "COMPOSITE"
OPtion "TVStandard" "NTSC-M"
Option "ConnectedMonitor" "TV"
Option "dpms"
Option "MonitorLayout" "CRT,TV"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "i810"
VendorName "Videocard vendor"
BoardName "Intel 852"
EndSection
Section "Device"
Identifier "Videocard1"
Driver "i810"
VendorName "Videocard Vendor"
BoardName "Intel 852"
BusID "PCI:0:2:0"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "800x600"
EndSubSection
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection[/code]
