Add 1600×900 (16:9) resolution to Ubuntu


$ xrandr

# look at the name of your device
# eDP1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
# HDMI1 disconnected (normal left inverted right x axis y axis)
# VGA1 disconnected (normal left inverted right x axis y axis)
# VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ xrandr --newmode "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync
$ xrandr --addmode eDP1 "1600x900_60.00"
$ xrandr --output eDP1 --mode "1600x900_60.00"

display_1600_900

source: http://ubuntuforums.org/showthread.php?t=1966900

update: Add it to your dm startup script

Find out what’s your default dm:

$ cat /etc/X11/default-display-manager

Eg. try adding pre-start or post-start scripts to /etc/init/lightdm.conf

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