Ubuntu – Running three screens (laptop and 2 external monitors)

Kind of an Ubuntu noob here. I'm trying to run 2 external monitors along with my laptop monitor on Ubuntu 11.04. I have a Lenovo T520 with the following graphics:

VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])

I have turned on all three displays under "Monitors", but only the two external screens are displaying anything. The laptop screen will not display.

Running xrandr gives the following (when both externals are hooked up):

Screen 0: minimum 320 x 200, current 3600 x 1080, maximum 8192 x 8192

LVDS1 connected (normal left inverted right x axis y axis)
1600×900 60.0 + 50.0
1440×900 59.9
1360×768 59.8 60.0
1152×864 60.0
1024×768 60.0
800×600 60.3 56.2
640×480 59.9

VGA1 connected 1680×1050+1920+0 (normal left inverted right x axis y axis) 473mm x 296mm
1680×1050 60.0*+
1600×1200 60.0
1280×1024 75.0 60.0
1440×900 75.0 59.9
1280×960 60.0
1152×864 75.0
1280×720 60.0
1024×768 75.1 70.1 60.0
832×624 74.6
800×600 72.2 75.0 60.3 56.2
640×480 72.8 75.0 66.7 60.0
720×400 70.1

HDMI1 connected 1920×1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
1920×1080 60.0*+
1600×1200 60.0
1680×1050 60.0
1280×1024 75.0 60.0
1440×900 75.0 59.9
1152×864 75.0
1280×720 60.0
1024×768 75.1 70.1 60.0
800×600 72.2 75.0 60.3 56.2
720×480 59.9
640×480 72.8 75.0 60.0
720×400 70.1

DP1 disconnected (normal left inverted right x axis y axis)

HDMI2 disconnected (normal left inverted right x axis y axis)

HDMI3 disconnected (normal left inverted right x axis y axis)

DP2 disconnected (normal left inverted right x axis y axis)

DP3 disconnected (normal left inverted right x axis y axis)

As you can see, the LVDS1 display is "connected" but no resolution is selected, even though a resolution is selected under the "Monitors" window. Am I doing something wrong? Or is this even possible? Sorry if this is a stupid question.