Monitor Resolution in ubuntu

I experienced a bug with Ubuntu, when i use extended monitors.
The monitor resolution was not getting recognized beyong 1024x720

I wanted the monitor resolution of 1440x900

Workaround:

user@host# xrandr --newmode "1440x900_60.00"  106.50  1440 1528 1672 1904  900 903 909 934 -hsync +vsync


user@host# xrandr --addmode VGA-1 1440x900_60.00

Next the newly added resolution can be selected from sytem->preferences->monitors