CentOS外接显示器投影仪
家里的上网本10英寸屏幕，太小，看电影需要效果，想接到大点的液晶上看，直接插上，本子没啥反应，搜索发现，需要费点时间配置下：需要添加一点配置到/etc/X11/xorg.conf 好让X11识别设备，配置好后的文件如下，添加 --- 说明的地方即为添加的配置信息：
#nvidia-xconfig:Xconfigurationfilegeneratedbynvidia-xconfig
#nvidia-xconfig:version1.0(buildmeister@builder63)FriAug1417:54:58PDT2009
Section"ServerLayout"
Identifier"Layout0"
Screen0"Screen0"00
InputDevice"Keyboard0""CoreKeyboard"
InputDevice"Mouse0""CorePointer"
Option"Xinerama""0"
EndSection
Section"Files"
FontPath"unix/:7100"
EndSection
Section"Module"
Load"dbe"
Load"type1"
Load"freetype"
Load"glx"
Load"extmod"
EndSection
Section"ServerFlags"
Option"Xinerama""0"
EndSection
Section"InputDevice"
#generatedfromdefault
Identifier"Mouse0"
Driver"mouse"
Option"Protocol""auto"
Option"Device""/dev/input/mice"
Option"Emulate3Buttons""yes"
Option"ZAxisMapping""45"
EndSection
Section"InputDevice"
#generatedfromdatain"/etc/sysconfig/keyboard"
Identifier"Keyboard0"
Driver"kbd"
Option"XkbLayout""us"
Option"XkbModel""pc105"
EndSection
Section"Monitor"
Identifier"Monitor0"
VendorName"Unknown"
ModelName"CMO"
HorizSync30.0-75.0
VertRefresh60.0
Option"DPMS"
EndSection
Section"Device"
Identifier"Device0"
Driver"nvidia"
VendorName"NVIDIACorporation"
BoardName"GeForce8400MG"
BusID"PCI:1:0:0"－－默认没有这个，添加上。
EndSection
Section"Screen"
#RemovedOption"metamodes""1280x800_60+0+0"
#RemovedOption"metamodes""nvidia-auto-select+0+0"
Identifier"Screen0"
Device"Device0"
Monitor"Monitor0"
Option"AddARGBGLXVisuals""True"
DefaultDepth24
Option"NoLogo""True"
Option"TwinView""true"－－默认是0，修改成true
Option"metamodes""1280x800+0+0"
SubSection"Display"
Depth24
EndSubSection
EndSection
==========
添加后，外接上显示器或者投影仪，登录时选在GNOME图形化登录，即可。如果是需要连接投影仪，那就需要双屏（笔记本和投影仪）都能显示，而且显示的完全一样，必须添加如下（黑体为添加的）：
Section "Screen"
Identifier"Screen0"
Device"Device0"
Monitor"Monitor0"
DefaultDepth24
Option"AddARGBGLXVisuals""True"
Option"TwinView""true"
Option"TwinViewOrientation""Clone"
Option"UseEdidFreqs""True"
#Option"metamodes""1280x800_60+0+0"
SubSection"Display"
Depth24
EndSubSection
EndSection注：以上是nVidia下的配置，如果是ati，可能不大一样。