Instructions for Setting Screen Resolutions in Ubuntu with GNOME using Xrandr #Linux
Although I’m personally totally fine with Unity, GNOME continues to be a hugely popular desktop environment for very obvious reasons: namely, use what works for you. As such you might find useful these instructions for using Xrandr to configure screen resolutions, provided by Kenyan embedded developer Karibe.
I have a HP W2072a LED screen for my work machine on which I ran Ubuntu with Gnome desktop environment. After installation or upgrade, I only have limited screen resolution modes. I got the supported resolutions from the datasheet. The best resolution for my screen from earlier experimenting was 1440 x 900 @ 60Hz. The following steps will help configure the VGA adapter for this resolution