graphics - VGA not detected on a Lenovo T420

I have problem with a VGA driver that is not detected on my Lenovo T420 with Ubuntu. 10.04

Output of lshw:

       *-display UNCLAIMED
         description: VGA compatible controller
         product: Intel Corporation
         vendor: Intel Corporation
         physical id: 2
         bus info: pci@0000:00:02.0
         version: 09
         width: 64 bits
         clock: 33MHz
         capabilities: bus_master cap_list
         configuration: latency=0
         resources: memory:f0000000-f03fffff memory:e0000000-efffffff(prefetchable) ioport:5000(size=64)

This is output from lspci -nn:

00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:0116] (rev 09)

When I install version 11 for testing it can detect the drivers:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)

*-display
description: VGA compatible controller
product: 2nd Generation Core Processor Family Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:42 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64)

On Ubuntu 10.04, I tried to install the xserver-xorg-video-intel driver but I'm still unable to get the right resolution on my display.

I've already tried the suggestion on Display not detected on a Thinkpad T420, but still no luck.