Removing AC power when laptop lid is closed doesn't suspend

view story

http://askubuntu.com – While the laptop lid is closed, when I remove external power, the laptop does not suspend so i have to open the lid and close to make it suspend. When the laptop lid is open, then I remove power, then close, it works fine. This used to work in Ubuntu 11.04.. Didn't work after upgrading to 11.10 and still not working now that I'm on 12.04 (HowTos)