Widescreen Resolutions for Intel Display Cards In Ubuntu Feisty
Open Up Your Terminal
Install i8xx,i9xx display driver
In order to use higher resolution install updated Intel i8xx, i9xx display driver. It is provided by a package called xserver-xorg-video-intel. This package provides the driver for the Intel i8xx and i9xx family of chipsets, including i810, i815, i830, i845, i855, i865, i915, and i945 series chips.
sudo apt-get install xserver-xorg-video-intel
When this is finished reboot your system
Now you need to go to System>Preferences>Screen Resolution to see all of the new options.