Hyper-V/Ubuntu server 12.04 - VM does not stop

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http://serverfault.com – i just installed a ubuntu 12.04 server on a 2008 R2 Hyper-V server and all is fine (networking/storage ...). There is just one thing, when i halt my linux (using "sudo halt"), i can see on the console that the system is halted but the vm status on hyper-v is still "started". Then i need to stop it on the hyper-v management tool. Anybody has an idea on how to properly stop this VM on hyper-V automatically ? Thanks, Alex (HowTos)