Comment 4 for bug 51084

i have the same problem. and i am quite sure this is not a problem caused by motherboard, or power distributor.
coz i have installed previous dapper, edgy and they all worked fine when it came to system shutdown, no power-button-press interference.
My guess it might be a bug in kernel or o breakage in Nvidia official driver. Just guess.
Ubuntu version is 7.04, motherboard 845PE, too old? VGA: MSI fx5200, (rubbish, even no fan on it)
any one has solved this problem?.