For the modeline, in a terminal type: gtf 1280 800 60 This should result in something like: Modeline "1280x800_60.00" 83.46 1280 1344 1480 1680 800 801 804 828 -HSync +Vsync Paste the output of this command (as a single line) into your /etc/X11/xorg.conf file under the "Monitor" section. You should also rename the modeline from "1280x800_60.00" to "1280x800". Next, you'll need to add "1280x800" to each of the subsections under the "Screen" section.
具體的步驟：
1、在命令行下輸入gtf 1280 800 60
60是分辨率，你的是1280x768就應該輸入gtf 1280 768 60，我只用過60，其他不太確定。
2、把回車後顯示的結果復制到/etc/X11/xorg.conf的"Monitor"段下，就像下面的配置文件中紅色字體中添加的一樣。最好把"1280x800_60.00"重命名成"1280x800"（你的就是1280x768，我沒重命名也行）
Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "LCD Panel 1280x800" HorizSync 31.5 - 90.0 VertRefresh 60.0 - 60.0 Modeline "1280x800_60.00" 83.46 1280 1344 1480 1680 800 801 804 828 -HSync +Vsync Option "dpms" EndSection
Section "Device" Identifier "Videocard0" Driver "i810" VendorName "Videocard vendor" BoardName "Intel 852" EndSection
3、在每個"Screen"段的字段下添加"1280x800"（1280x768）。
Section "Screen" Identifier "Screen0" Device "Videocard0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 16 Modes "1280x800" "800x600" "640x480" EndSubSection SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x800" "1024x768" "800x600" "640x480" EndSubSection EndSection
然後重啟系統看看^0^