Shutdown: i must press a key to poweroff.

[Francesco Bolzoni]

Hi all.
I own an ACER 7520G notebook, with ubuntu 8.10.
Everytime i want shutdown the sistem, if i don't press the enter key the
system stay there without poweroff.
Yesterday, I forget to do itand system wait for the key for about 4
hours. Just after i press the enter key it poweroff.

I had ubuntu 8.04 also, but theren't the need to press the key to
poweroff.

Any suggestion ?

Thanks