ubuntu 11.04 配置双显示器

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# nvidia-settings: X configuration file generated by nvidia-settings# nvidia-settings:  version 270.29  (buildd@roseapple)  Fri Feb 25 14:43:24 UTC 2011Section "ServerLayout"    Identifier     "Layout0"    Screen      0  "Screen0" 0 0    InputDevice    "Keyboard0" "CoreKeyboard"    InputDevice    "Mouse0" "CorePointer"    Option         "Xinerama" "0"EndSectionSection "Files"EndSectionSection "InputDevice"    # generated from default    Identifier     "Mouse0"    Driver         "mouse"    Option         "Protocol" "auto"    Option         "Device" "/dev/psaux"    Option         "Emulate3Buttons" "no"    Option         "ZAxisMapping" "4 5"EndSectionSection "InputDevice"    # generated from default    Identifier     "Keyboard0"    Driver         "kbd"EndSectionSection "Monitor"    # HorizSync source: edid, VertRefresh source: edid    Identifier     "Monitor0"    VendorName     "Unknown"    ModelName      "DELL E170S"    HorizSync       30.0 - 81.0    VertRefresh     56.0 - 76.0    Option         "DPMS"EndSectionSection "Device"    Option "TwinView" "on"    Option "MetaModes" "1280x1024,1280x1024"    Option "SecondMonitorHorizSync" "28-80"    Option "SecondMonitorVertRefresh" "43-60"    Option "TwinViewOrientation" "RightOf"    Identifier     "Device0"    Driver         "nvidia"    VendorName     "NVIDIA Corporation"    BoardName      "GeForce 9300 GS"EndSectionSection "Screen"# Removed Option "TwinViewXineramaInfoOrder" "CRT-1"    Identifier     "Screen0"    Device         "Device0"    Monitor        "Monitor0"    DefaultDepth    24    Option         "TwinView" "1"    Option         "TwinViewXineramaInfoOrder" "CRT-0"    Option         "metamodes" "CRT-0: nvidia-auto-select +0+0, CRT-1: nvidia-auto-select +1280+0"    SubSection     "Display"        Depth       24    EndSubSectionEndSection

关键是：
在Device 段，加入如下内容：

Option "TwinView" "on"
Option "MetaModes" "1280x1024,1280x768"
Option "SecondMonitorHorizSync" "28-80"
Option "SecondMonitorVertRefresh" "43-60"
Option "TwinViewOrientation" "RightOf"

配置好后执行如下的命令：
按alt + ctrl + f1 ，切换文本工作区
执行：

sudo /etc/init.d/gdm stop
sudo /etc/init.d/gdm start