在linux系统安装完成后，默认情况下系统的分辨率是800*600

要想修改成1024*768的分辨率需要做以下操作：

#vi /etc/X11/xorg.conf
将HorizSync修改为30 - 70
  VertRefresh  50.0 - 160
  Modes   "1024x768" "800x600" "640x480"(有两处)
内容如下所示：

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Unknown monitor"
#       HorizSync    31.5 - 37.9
        HorizSync    30 - 70
#       VertRefresh  50.0 - 70.0
        VertRefresh  50.0 - 160
        Option      "dpms"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "vesa"
        VendorName  "Videocard vendor"
        BoardName   "VESA driver (generic)"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes   "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes   "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

说明：HorizSync指水平同步率
      VertRefresh指垂直刷新率
      如果不修改以上两个指标，仅仅修改modes是达不到显示器分辨率的

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