How to modify the boot resolution of ubuntu12.10/etc/X11 to create xorg. conf file Section "Device" Identifier "Configured Video Device" EndSection Section "Monitor" Identifier "Configured Monitor" Modeline "1440x900_60.00" 106.47 1440 1520 1672 1904 900 901-HSync + Vsync EndSection section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Modes "1440x900" "10 24x768 "EndSubSection EndSection terminal input command: gtf 1024 768 60 this 1024 768 is the resolution you want to set, this 60 is the update rate you want to set. The command result is as follows: $ gtf 1024 768 60 #1024x768 @ 60.00Hz (GTF) hsync: 47.70 kHz; pclk: 64.11 MHz Modeline "1024x768_60.00" 64.11 1024 1080 1184 1344 768 769 772-HSync + Vsync directly copies the Modeline line in the Command result to the Section "Monitor" block.