After installing Ubuntu 10.04 with my Samsung SyncMaster B2030, native resolution (1600X900) is not found in the list of resolutions.
Native resolution for Samsung SyncMaster B2030 is 1600 * 600 60 Hz
Generate the modeline using
cvt 1600 900 60
which will be:
# 1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz Modeline "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync
Get the name of the output to which your display is connected:
This outputs among other things:
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192 VGA1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
In this example the name of the output is
Create the new modeline (with the values from the output of
xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync
- the above should be in a single line
- make note of x in 1600 x 900_60.00
Add the above created modeline:
xrandr --addmode VGA1 1600x900_60.00
If everything went well xrandr will list your newly added resolution.
Test the newly added resolution:
xrandr --output VGA1 --mode 1600x900_60.00
The resolution you set with the above commands will not persist across sessions. Until Ubuntu 11.04 you can add the following lines at the beginning of your
/etc/gdm/Init/Default to set the resolution automatically every time you log in:
xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync xrandr --addmode VGA1 1600x900_60.00 xrandr --output VGA1 --mode 1600x900_60.00
This question describes other ways to make
xrandr customizations permanent.
First type in xrandr in your terminal and see which is the connected device. It maybe VGA1 as it is in this case. If not then replace VGA1 by your connected device in the commands below. Then create a new document and name it eg:- "yourname.sh" Type in:
xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync xrandr --addmode VGA1 1600x900_60.00 xrandr --output VGA1 --mode 1600x900_60.00 unity --replace
and save it in your home folder (this is for resolution 1600x900). Make it executable by:
chmod a+x ~/yourname.sh
open startup applications and click "ADD". Give a name and type in the command line
click save. The change appears after you log out and log in
If you don't want to go through the bother of running all the commands as instructed in other answers, you can use a tool that does it all for you:
- executes the
- executes the
- creates a startup file that executes the above upon login.
You can download the program here.