I found these answers, but they're old and I wonder if there are any new solutions for this.
This answer says add
xrandr commands to
And this answer says to edit
/etc/X11/xorg.conf which I don't have on my ubuntu 14.04.
This explains how to create an xorg.conf file in case I don't have one.
I've also found this method of running a script on startup to add the required resolution and setting it to the relevant screen. It looks a bit hacky and I'd like to know if there's a better way.
Are these relevant to 14.04 in 2017?