今天开机发现ubuntu分辨率不正常只有1024×768, Displays选项卡下面最大的分辨率是1024×768。元芳，此事你怎么看？
1.
sun@ubuntu:~$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*
800x600 60.3 56.2
848x480 60.0
640x480 59.9
sun@ubuntu:~$ cvt 1440 900
# 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
sun@ubuntu:~$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*
800x600 60.3 56.2
848x480 60.0
640x480 59.9
sun@ubuntu:~$ cvt 1440 900
# 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
sun@ubuntu:~$ xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync 中间的×与*容易混淆
sun@ubuntu:~$ xrandr --newmode "1440*900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
sun@ubuntu:~$ xrandr --addmode VGA1 1440*900_60.00
sun@ubuntu:~$ xrandr --output VAG1 --mode 1440*900_60.00
warning: output VAG1 not found; ignoring
sun@ubuntu:~$ xrandr --output VAG1 --mode 1440*900_60.00^C
sun@ubuntu:~$ sudo cp /etc/X11/xorg.conf.failsafe /etc/X11/xorg.conf
[sudo] password for sun:
sun@ubuntu:~$ vi /etc/X11/xorg.conf
sun@ubuntu:~$ sudo gedit /etc/X11/xorg.conf
原文：http://www.cnblogs.com/huashiyiqike/p/3595308.html