Ubuntu – How to change screen resolution

You can set resolution using following command.

xrandr --output VGA1 --mode 1440x900 

You have to change VGA1 according to xrander properties of your computer. You can find it by the second line of your xrandr output.

If 1440x900 mode is not in your xrandr you have to manually add it by using the commands below.

gtf 1440 900 85

85 is the refresh rate. Then the output would be some thing like this,

# 1440x900 @ 85.00 Hz (GTF) hsync: 80.33 kHz; pclk: 156.79 MHz
  Modeline "1440x900_85.00"  156.79  1440 1536 1696 1952  900 901 904 945  -HSync +Vsync

To add a new mode use the command below with the above output without 'Modline' word

xrandr --newmode "1440x900_85.00"  156.79  1440 1536 1696 1952  900 901 904 945  -HSync +Vsync
xrandr --addmode VGA1 1440x900_85.00

Then to use it type command below.

xrandr --output VGA1 --mode 1440x900_85.00

You can change screen resolution size via CLI , use following cmd:

xrandr

(It will show you current screen resolution and available modes.

Now you can change the size by issuing this cmd:

xrandr --output VGA-0 --mode 1024x768

Note:

(change the VGA-0 according to what xrandr shows vga syntax for your card, in my example it shows VGA-0)