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屏幕分辨率改不了，只有800 600，是怎么回事？偶用的显卡是nvidia geforce 8400，是不是下面有问题？请赐教！！！
# 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"
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"
Driver "nvidia"
Option "NoLogo" "True"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Nvidia GeForce8400"
Monitor "Nvidia GeForce8400"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
screen "Default Screen"
Inputdevice "Synaptics Touchpad"
EndSection
Section "Module"
Load "glx"
EndSection

有没装闭源驱动----源里的受限驱动或官方的新驱动？有没有在纯端下运行nvidia-xconfig生成对应的xorg.conf文件？有没有sudo nvidia-xsettings？

谢谢楼上，我在终端中输入：sudo dpkg -reconfigure -phigh xserver-xorg，重新产生xorg.conf文件，然后重启就可以了。但是不能够启动显卡中等性能，就不能开启3D效果，这是不是我的显卡驱动没装好，还是我哪没设置？

受限驱动装了没有？系统-系统管理-硬件驱动 去看看。

czjl 写了：受限驱动装了没有？系统-系统管理-硬件驱动 去看看。

下图少了个nvidia显卡的选项，请问怎么操作才能正常？

产生如下问题，请问如何解决？