在/etc/X11下手動產生xorg.conf文件，

# vi /etc/X11/xorg.conf

文件中內容如下：

##Add the following codes:

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 28.0 - 70.0
VertRefresh 56.0 - 75.0
EndSection

Section "Device"
Identifier "Card0"
Driver "vesa"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1024x768" "800x600"
EndSubSection
EndSection

保存並重啟，默認就會以xorg.conf中定義的最高分辨率顯示了，display選項中可以修改。

比如，現在開起來太大了，我就把Modes改成 "1024x768" "800x600"

Red Hat Linux分辨率調整