Apparently this problem exists also on Linux
systems. So I've made a mini-version for the penguin.
It simply sets the Northbridges "enable bus disconnect on STPGNT" bit and enters an idle loop that puts the CPU into STPGNT state.
Originally I had only written the source but now Stefan Kraus has made this packet that includes a makefile and an installer for SUSE distributions (Thanks, Stefan).
You'll have to enable the referer tag to use these links - this is required
by freeservers.com, sorry
If you still have trouble drop me a mail.