My Thinkpad T410s doesn't work VGA Output function

I bought Lenovo Thinkpad T410s on October 30.
Debian GNU/Linux unstable is running on my Thinkpad.
My Thinkpad's spec is as follows.

Intel(R) Core(TM) i5 CPU M 560 @ 2.67GHz
DDR3 Memory 8GB
Intel on chip video cards. Not Nvidia.
2.0 M pixel Camera
US Keyboard
fingerprint certification
Samsung 128 GB SSD

But VGA output function doesn't work.
So I cannot make a presentation usage Thinkpad T410s!!
Does your Thinkpad T410s work VGA output function?

If your Thinkpad T410s is running Linux, please comment on whether VGA output function is good.

$ uname -a
Linux t410s 2.6.36-trunk-amd64 #1 SMP Wed Oct 27 14:28:29 UTC 2010 x86_64 GNU/Linux