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。

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

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"
    Option         "TwinView" "true"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"
    Option         "MetaModes" "1024x768, 1280x1024"
    Option         "TwinViewOrientation" "CRT-0 LeftOf DFP-0"
    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