Can't poweroff with shutdown -p now

Hi,

I've run in a problem lately with powering off my system. It happens only if 
dbus and hal services are running.
I can do shutdown -p now when:
1) I boot in single mode. System halts and power offs
2) I'm running kde4.3 and stop hal and dbus (I don't know yet which is causing 
problems)

When those services are running and I execute shutdown -p now system halts and 
prints

The operating system has halted.
Please press any key to reboot.

I've had runned on this machine Vista and Debian and PC-BSD, all three of them 
could power off system.

Is this related to hald or dbus?