1.修正/etc/X11/xorg.conf ；查看类似下面的一段；
引用:Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x800"
EndSubSection
EndSection
添加的内容
2.下载915resolution软件包。
到 http://atrpms.net/dist/el5/915resolution/ 下载915resolution-0.5.2-5.0.el5.i386.rpm 然后在图形界面下右键选择 用包管理器安装，自动安装完成
3.用915resolution列出vbios的模式：用 -l参数；
引用:# 915resolution -l
915resolution version 0.4, by Alain Poirier
Chipset: 915GM (id=0x35808086)
VBIOS type: 2
VBIOS Version: 3360
Mode 30 : 640x480, 8 bits/pixel
Mode 32 : 800x600, 8 bits/pixel
Mode 34 : 1024x768, 8 bits/pixel
Mode 38 : 1280x1024, 8 bits/pixel
Mode 3a : 1600x1200, 8 bits/pixel
Mode 3c : 1920x1440, 8 bits/pixel
Mode 41 : 640x480, 16 bits/pixel
Mode 43 : 800x600, 16 bits/pixel
Mode 45 : 1024x768, 16 bits/pixel
Mode 49 : 1280x1024, 16 bits/pixel
Mode 4b : 1600x1200, 16 bits/pixel
Mode 4d : 1920x1440, 16 bits/pixel
Mode 50 : 640x480, 32 bits/pixel
Mode 52 : 800x600, 32 bits/pixel
Mode 54 : 1024x768, 32 bits/pixel
Mode 58 : 1280x1024, 32 bits/pixel
Mode 5a : 1600x1200, 32 bits/pixel
Mode 5c : 1920x1440, 32 bits/pixel
Mode 7c : 1280x768, 8 bits/pixel
Mode 7d : 1280x768, 16 bits/pixel
Mode 7e : 1280x768, 32 bits/pixel
然后运行915resolution，把Mode54的1024X768＠32（当前分辨率）改成1280X800
＃915resolution 54 1280 800
分辨率立即就会变成1280X800＠32bit。但是重启后还是1024X768的分辨率
4.自动在开机时加再915resolution调整分辨率
编辑 /etc/rc.d/rc.local 文件，添加
915resolution 54 1280 800
保存重启，就可在登录界面时获得1280X800的分辨率。