教学用笔记本无法接外接显示

[RegentW]

我在多媒体教室上课，是那种有中控台的。中控系统打开后，接笔记本VGA口然后打开笔记本Ubuntu系统，但中控台切换到外接电脑模式时屏幕上显示不出笔记本的内容，漆黑一片。因教学软件比较复杂无法在中控电脑上安装，我只能用笔记本外接的方式啊，请问有在这种教室用笔记本的经验的朋友吗？是不是Ubuntu需要安装什么包？ 先谢谢了

[jarodlau]

是不是要搞定双头显示
？

要改xorg配置的吧

[RegentW]

是不是要搞定双头显示
？

要改xorg配置的吧

哦，怎么改，多谢回复

[jarodlau]

搜索一下论坛 “多头显示”

google “linux 多头显示”

[eexpress]

搜索 xrandr

[RegentW]

多谢两位，还要找时间去教室试下

[RegentW]

我在“显示器和显卡”那里设置“显示器2”为第二显示器，扩展默认显示为从右至左（不知是什么含义），系统要求所有用户退出才能使用新配置。我就重启了一下，结果原来的1280x800没有了，启动时640x480，60Hz，再打开“显示器和显卡”时看到的是这样

[RegentW]

很痛苦啊，怎么改回来？

[RegentW]

我现在的/etc/X11/xorg.conf：

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by failsafeDexconf, using
# values from the debconf database and some overrides to use vesa mode.
#
# You should use dexconf or another such tool for creating a "real" xorg.conf
# For example:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "cn"
Option "XkbOptions" "lv3:ralt_switch"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection


Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "HorizEdgeScroll" "0"
EndSection
Section "Device"
Identifier "Configured Video Device"
Boardname "vesa"
Busid "PCI:0:2:1"
Driver "vesa"
Screen 0
EndSection

Section "Monitor"
Identifier "Configured Monitor"
Vendorname "Plug 'n' Play"
Modelname "Plug 'n' Play"
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
Gamma 1.0
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
Defaultdepth 24
SubSection "Display"
Depth 24
Virtual 640 480
Modes "640x480@60"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
screen 0 "Default Screen" 0 0
Inputdevice "Synaptics Touchpad"
EndSection
Section "Module"
Load "glx"
Load "GLcore"
Load "v4l"
EndSection
Section "device" #
Identifier "device1"
Boardname "Intel 915"
Busid "PCI:0:2:0"
Driver "i810"
Screen 0
Vendorname "Intel"
EndSection
Section "screen" #
Identifier "screen1"
Device "device1"
Defaultdepth 24
Monitor "monitor1"
EndSection
Section "monitor" #
Identifier "monitor1"
Gamma 1.0
EndSection
Section "device" #
Identifier "device2"
Boardname "vesa"
Busid "PCI:0:2:1"
Driver "vesa"
Screen 1
EndSection
Section "screen" #
Identifier "screen2"
Device "device2"
Defaultdepth 24
Monitor "monitor2"
EndSection
Section "monitor" #
Identifier "monitor2"
Gamma 1.0
EndSection
Section "ServerFlags"
EndSection