Problem with power switch on 9.3

Hi Folks, On a Tyan 2875 with dual 246 Opterons I had 9.2 working so that a tap of the power button would issue a "halt" command and actually turn off the power. Alas, with 9.3 I get the "halt" behavior but the power isn't turned off. I rebooted with 9.2 and it works, back to 9.3 and it doesn't. I've configured everything I can find, but maybe I missed something? Other than this, so far 9.3 is a keeper in my book. Regards, Lew Wolfgang