雙螢幕有兩種

1. dual screen
2. twinview

如果使用 Nvidia 的卡，可以在雙螢幕下啟動3d加速以及不同的解析度，但加速只有 primary screen才有。

http://us.download.nvidia.com/XFree86/Linux-x86/1.0-9755/README/index.html

I. Installation Instructions
  3. Configuring X for the NVIDIA Driver
    Editing the configuration file by hand
III. Appendices
  G. Configuring TwinView
  P. Configuring Multiple X Screens on One Card

http://www.ublug.org/ubuntu/twinview/twinview-howto-breezy.html

http://ubuntuforums.org/showthread.php?p=1773584

http://gentoo-wiki.com/HOWTO_Dual_Monitors

http://gentoo-wiki.com/HOWTO_nVidia_TwinView

MetaModes 為兩個螢幕的解析度，可以有多組設定值。

Option "MetaModes" "<mode name 0>, <mode name 1>; <mode name 2>, <mode name 3>"
Option "MetaModes" "1024x768, 1280x1024"

若後面再接一個小老鼠的桌面解析度「Panning Domain」，當 Panning Domain 大於螢幕解析度時仍可正常顯示，空間不足無法顯示的部份，當滑鼠移動過去時，視窗會跟著移動。

Option "MetaModes" "1024x768 @1024x1024, 1280x1024"    # 第一個螢幕的桌面解析度為 1024x1024

Section "Device"
    Option         "NoLogo" "True"
    Identifier     "NVIDIA Corporation NV36.2 [GeForce FX 5700]"
    Driver         "nvidia"
    BusID          "AGP:1:0:0"
    Option         "ConnectedMonitor" "DFP-0, CRT-0"    # 想要使用哪些輸出
    Option         "TwinView" "true"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"    # 以哪個輸出為主(工具列所在)
    Option         "MetaModes" "1024x768 @1024x1024, 1280x1024"
    Option         "TwinViewOrientation" "CRT-0 LeftOf DFP-0"    # 螢幕的相對位置
    Option         "SecondMonitorHorizSync" "28.0 - 64.0"
    Option         "SecondMonitorVertRefresh" "43.0 - 60.0"
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "NVIDIA Corporation NV36.2 [GeForce FX 5700]"
    Monitor        "Generic Monitor"
    DefaultDepth    24
    Option         "UseDisplayDevice" "DFP-0, CRT-0"
    Option         "UseEdidFreqs" "True"
    SubSection     "Display"
        Depth       24
        Modes      "1280x1024"
    EndSubSection
EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
Option "UseEdidFreqs" "true"
Option "RenderAccel" "false"
Option "TwinView"
Option "NoTwinViewXineramaInfo" "true"
Option "MetaModes" "1280x1024,1280x1024"
Option "TwinViewOrientation" "Clone"
Option "ConnectedMonitor" "DFP,CRT"
EndSection

外接螢幕或投影機

Section “Device”
Identifier “Intel Corporation 82852/855GM Integrated Graphics Device”
Driver “i810″
Option “MonitorLayout” “CRT,LFP”
Option “Clone” “true”
BusID “PCI:0:2:0″
EndSection 

將字型檔放在

/usr/share/fonts/turetype

然後執行

# fc-cache -v -f