KDE4 Can't change resolution problem

I'm running FreeBSD 9.1. Installed Xorg and KDE4 via pkg_add(1). The problem is that I can't change the desktop resolution. My built-in display is capable of having 1366x768. But there are only two options available, 1024x768 and 800x600.

I have Intel Sandybridge (onboard) graphics. And xf86-video-intel driver is already installed. When I tried to add modeline to xrandr, it showed some failure to load gamma value error. Can anyone help?
 
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