OBSD 3.7 @ Samsung P35: Ati powerplay, disable system beeps?

[Vincent Immler]

Hi folks,

I just installed OpenBSD 3.7 on my Samsung P35 XVM 1600 III. Speedstep 
works fine, but what about Ati's powerplay?
Another problem I have:
During system shutdown/reboot the system usually beeps, but on my P35 
this beep is very loud, how to disable it?

Thanks in advance,
Vincent