Set Screen Resolution in 2nd monitor - Ubuntu 14.04

Set Screen Resolution.txt

Step 1
xrandr - check the monitor name, here in our example it is - eDP-1

Step 2 
cvt 1600 900

Step 3
sudo xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

Step 4
sudo xrandr --addmode eDP-1 "1600x900_60.00"

To make the above process automatic, 

gedit ~/.profile , add the last 2 commands to the end, commands in step 3 and 4, and save the file.

Above gist is made from  http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/