看了好多资料都没有解决
今天问了一个达人，
总算达到目的了
有同样问题的，看看这个页面吧
呵呵
https://help.ubuntu.com/community/FixVideoResolutionHowto
发现自己还是记不住，
自己把它翻译一下（因为我的显示芯片是i810的，所以只说i810）
首先，是安装intel最新的驱动，这个在Ubuntu 7.10里面就不用再安装了，系统本来就集成了
sudo apt-get install xserver-xorg-video-intel
然后，编辑xorg.conf文件
sudo vi /etc/X11/xorg.conf
找到如下这一行
Driver "i810"
把它改成
Driver "intel"
保存，退出
然后就是安装915resolution
sudo apt-get install 915resolution
安装完成之后，可以用下面的命令查看所有可用的模式
sudo 915resolution －l
应该可以得到下面的结果
Intel 800/900 Series VBIOS Hack : version 0.5.3
Chipset: G33
BIOS: TYPE 1
Mode Table Offset: $C0000 + $269
Mode Table Entries: 27
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
Chipset: G33
BIOS: TYPE 1
Mode Table Offset: $C0000 + $269
Mode Table Entries: 27
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
如果你的模式不在上面所说的当中，我们就可以通过下面途径来进行修改
首先，用vi打开/etc/default/915resolution
sudo nano /etc/default/915resolution
根据自己的需要按如下样式修改
#
# 915resolution default
#
# find free modes by /usr/sbin/915resolution -l
# and set it to MODE or set to 'MODE=auto'
#
MODE=41
#
# and set resolutions for the mode.
XRESO=1440
YRESO=900
# 915resolution default
#
# find free modes by /usr/sbin/915resolution -l
# and set it to MODE or set to 'MODE=auto'
#
MODE=41
#
# and set resolutions for the mode.
XRESO=1440
YRESO=900
最后一步，当然就是重启X就OK了