我已经尝试解决这个问题两年了。哈哈，今天我安装了 Ubuntu，因为我必须解决这个问题，否则我就会回到愚蠢的 Windows 7。
首先，我有 3 个显示器。我的显卡支持双显卡 (ATI Radeon)，因此在 VGA 和 DVI 上扩展这些多显示器没有任何问题。
第三台显示器是 Displaylink USB。安装完所有必需的东西后，当我重新启动时，Displaylink 显示器会显示“Ubuntu ....”之类的徽标/加载屏幕。
我转到系统>显示，检测监视器，它仅显示我的第一和第二个，没有第三个 Displaylink。
我可以在第一个和第二个之间移动鼠标，但第三个只显示 Ubuntu 屏幕。
我按下Ctrl+ Alt+ 1，然后屏幕切换到 Displaylink USB 3RD 显示器，但它的“终端”而不是桌面。
然后我按下Ctrl+ Alt+ 7，屏幕切换回我的第一个、第二个，并且显示链接第三个又回到了 Logo / Ubuntu。
这是我的/etc/X11/xorg.conf：
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "aticonfig-Screen[0]-0" 0 0
Screen 1 "DisplayLinkScreen" Leftof "aticonfig-Screen[0]-0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/X11/misc"
FontPath "/usr/share/fonts/X11/cyrillic"
FontPath "/usr/share/fonts/X11/100dpi/:unscaled"
FontPath "/usr/share/fonts/X11/75dpi/:unscaled"
FontPath "/usr/share/fonts/X11/Type1"
FontPath "/usr/share/fonts/X11/100dpi"
FontPath "/usr/share/fonts/X11/75dpi"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
FontPath "built-ins"
EndSection
Section "Module"
Load "glx"
Load "dri2"
Load "dbe"
Load "dri"
Load "record"
Load "extmod"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "DisplayLinkMonitor"
EndSection
Section "Monitor"
Identifier "0-DFP1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1680x1050"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Monitor"
Identifier "0-CRT2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "1680 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "NoAccel" # [<bool>]
#Option "SWcursor" # [<bool>]
#Option "Dac6Bit" # [<bool>]
#Option "Dac8Bit" # [<bool>]
#Option "BusType" # [<str>]
#Option "CPPIOMode" # [<bool>]
#Option "CPusecTimeout" # <i>
#Option "AGPMode" # <i>
#Option "AGPFastWrite" # [<bool>]
#Option "AGPSize" # <i>
#Option "GARTSize" # <i>
#Option "RingSize" # <i>
#Option "BufferSize" # <i>
#Option "EnableDepthMoves" # [<bool>]
#Option "EnablePageFlip" # [<bool>]
#Option "NoBackBuffer" # [<bool>]
#Option "DMAForXv" # [<bool>]
#Option "FBTexPercent" # <i>
#Option "DepthBits" # <i>
#Option "PCIAPERSize" # <i>
#Option "AccelDFS" # [<bool>]
#Option "IgnoreEDID" # [<bool>]
#Option "CustomEDID" # [<str>]
#Option "DisplayPriority" # [<str>]
#Option "PanelSize" # [<str>]
#Option "ForceMinDotClock" # <freq>
#Option "ColorTiling" # [<bool>]
#Option "VideoKey" # <i>
#Option "RageTheatreCrystal" # <i>
#Option "RageTheatreTunerPort" # <i>
#Option "RageTheatreCompositePort" # <i>
#Option "RageTheatreSVideoPort" # <i>
#Option "TunerType" # <i>
#Option "RageTheatreMicrocPath" # <str>
#Option "RageTheatreMicrocType" # <str>
#Option "ScalerWidth" # <i>
#Option "RenderAccel" # [<bool>]
#Option "SubPixelOrder" # [<str>]
#Option "ClockGating" # [<bool>]
#Option "VGAAccess" # [<bool>]
#Option "ReverseDDC" # [<bool>]
#Option "LVDSProbePLL" # [<bool>]
#Option "AccelMethod" # <str>
#Option "DRI" # [<bool>]
#Option "ConnectorTable" # <str>
#Option "DefaultConnectorTable" # [<bool>]
#Option "DefaultTMDSPLL" # [<bool>]
#Option "TVDACLoadDetect" # [<bool>]
#Option "ForceTVOut" # [<bool>]
#Option "TVStandard" # <str>
#Option "IgnoreLidStatus" # [<bool>]
#Option "DefaultTVDACAdj" # [<bool>]
#Option "Int10" # [<bool>]
#Option "EXAVSync" # [<bool>]
#Option "ATOMTVOut" # [<bool>]
#Option "R4xxATOM" # [<bool>]
#Option "ForceLowPowerMode" # [<bool>]
#Option "DynamicPM" # [<bool>]
#Option "NewPLL" # [<bool>]
#Option "ZaphodHeads" # <str>
Identifier "Card0"
Driver "radeon"
BusID "PCI:5:0:0"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "Rotate" # <str>
#Option "fbdev" # <str>
#Option "debug" # [<bool>]
Identifier "Card1"
Driver "fbdev"
BusID "PCI:5:0:0"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "DefaultRefresh" # [<bool>]
#Option "ModeSetClearScreen" # [<bool>]
Identifier "Card2"
Driver "vesa"
BusID "PCI:5:0:0"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "Monitor-DFP1" "0-DFP1"
Option "Monitor-CRT2" "0-CRT2"
BusID "PCI:5:0:0"
EndSection
Section "Device"
Identifier "DisplayLinkDevice"
Driver "displaylink"
Option "fbdev" "/dev/fb1"
Option "ShadowFB" "off"
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Virtual 3600 1920
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "DisplayLinkScreen"
Device "DisplayLinkDevice"
Monitor "DisplayLinkMonitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1920x1080"
EndSubSection
EndSection
答案1
我有两点建议：
首先，确保已安装 DisplayLink 驱动程序：
sudo apt-get install xserver-xorg-video-displaylink
重新启动并重新生成 xorg.conf——或者尝试不使用它；X 在自动配置方面相当不错。无论如何，看起来 X 在某种程度上检测到了它（除非您手写了那个 xorg.conf），因此驱动程序可能已经安装。
我的第二个建议：通读此主题看看你是否能从这些技巧中获得乐趣。唯一与你的设置有很大不同的部分是关于“在文件末尾的“exit 0”上方将以下内容添加到 /etc/gdm/Init/Default 中：”
### set display for attached USB devices
XRANDR=`gdmwhich xrandr`
if [ "x$XRANDR" != "x" ] ; then
$XRANDR -o 0
fi
最后，查看您的 X 日志；有时 (!) 可以从中收集有用的信息。或者将它们发布在这里；我很乐意查看它们。
答案2
我认为你可能需要指定
Option "Xinerama" "Off"
在您的ServerLayout部分中。这将阻止您在监视器之间拖动窗口，但可能会有所帮助。
您可能还想尝试将数字Depth从 24 减少到 16。
最后，您fbdev也可以尝试使用 Radeon 的驱动程序 - 这会严重降低该卡的性能。
在进行任何更改之前，请确保备份你的 xorg.conf。