Dell 640m的双显示器配置

参考了一下Ubuntu论坛里一个帖子，配置好了双显示器，也算是把多出来的一个显示器利用上了。这里是xorg.conf的后半部分：

Section "Device"
  BoardName    "945 GM"
  BusID        "0:2:0"
  Driver       "i810"
  Identifier   "Device[1]"
  Option       "MonitorLayout" "CRT,LFP"
  Screen       1
  VendorName   "Intel"
EndSection

Section "Device"
  BoardName    "945 GM"
  BusID        "0:2:0"
  Driver       "i810"
  Identifier   "Device[0]"
  Screen       0
  VendorName   "Intel"
EndSection

Section "Monitor"
  DisplaySize  340 270
  Identifier   "Monitor[0]"
  ModelName    "DELL 1708FP"
  VendorName   "DELL"
  Option       "DPMS"
  HorizSync    31-80
  VertRefresh  56-75
EndSection

Section "Monitor"
  DisplaySize  305 230
  Identifier   "Monitor[1]"
  ModelName    "DELL 1280X800 LAPTOP"
  VendorName   "DELL"
  Option       "DPMS"
  HorizSync    30-67
  VertRefresh  30-60
EndSection

Section "Screen"
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
  DefaultDepth 24
  SubSection "Display"
    Modes      "1280x1024" "1152x864" "1024x768" "800x600" "720x400" "640x480"
  EndSubSection
EndSection

Section "Screen"
  Device       "Device[1]"
  Identifier   "Screen[1]"
  Monitor      "Monitor[1]"
  DefaultDepth 24
  SubSection "Display"
    Modes      "1280x800" "1024x768" "800x600" "640x480"
  EndSubSection
EndSection

Section "ServerLayout"
  Identifier   "Default Layout"
  InputDevice  "Generic Keyboard"
  InputDevice  "Configured Mouse"
  Option       "Clone"    "off"
  Option       "Xinerama" "on"
  Screen       "Screen[1]" leftof "Screen[0]"
  Screen       "Screen[0]"
  InputDevice  "Synaptics Touchpad"
  InputDevice  "stylus" "SendCoreEvents"
  InputDevice  "cursor" "SendCoreEvents"
  InputDevice  "eraser" "SendCoreEvents"
EndSection

Section "DRI"
  Mode 0666
EndSection

Xinerama模式非常好用，笔记本屏幕的和外接的DELL LCD显示器都可以打到最大分辨率；如果按ctrl_alt_"num +"或者ctrl_alt_"num 1"，还可以即时切换鼠标指针所在屏幕的分辨率，在外接投影仪时很方便。让我很纳闷的是，配置里“Screen "Screen[0]"”这一句必须写在screen[1]的后面，不知道是什么原因。