[问题]我的BUNTUN欢迎的界面分辩率变成了800X600，如何才能恢复到1280X800呢

[demo8210]

又遇到问题了，某天开机，发现显卡找不着了，然后重装显卡驱动后发现欢迎界面分辩率变成了800X600，如何才能恢复到1280X800呢，）照着网上的方法试了修改显示分辩率，也不行，

[demo8210]

# 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 "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
SubSection "Display"
Depth 24
Virtual 1280 800
Modes "800x600@60" "1280x800@60" "800x600@56" "640x480@60"
EndSubSection
Option "AddARGBGLXVisuals" "True"
Defaultdepth 24
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
Option "AddARGBGLXVisuals" "True"
Defaultdepth 24
EndSection

Section "Device"
Identifier "Configured Video Device"
Boardname "vesa"
Busid "PCI:4:0:0"
Driver "nvidia"
Screen 0
Option "NoLogo" "True"
EndSection

Section "Device"
Identifier "device1"
Boardname "vesa"
Busid "PCI:4:0:0"
Driver "nvidia"
Screen 1
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
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 "ServerLayout"
Identifier "Default Layout"
screen 0 "Default Screen" 0 0
Inputdevice "Synaptics Touchpad"
EndSection

Section "Module"
Load "glx"
Load "v4l"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
Vendorname "Generic LCD Display"
Modelname "LCD Panel 1280x800"
Horizsync 50.5-60.0
Vertrefresh 56.0 - 65.0
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "1024x768@
EndSection

Section "Monitor"
Identifier "monitor1"
Gamma 1.0
EndSection

Section "Extensions"
Option "Composite" "Enable"
EndSection

[demo8210]

Vertrefresh 56.0 - 65.0
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "1024x768@

照网上的方法
我单改这个成1280X800对不对？其余的删了