runaway kacpid

I've had Suse 9.2 since it was released and have been having increased problems with kacpid. Every few days it suddenly starts hogging 48% of the CPU with a priority -10. If I "kill" it, it just starts right back up. Dropping the prority to +10 doesn't help. The only way to stop it seems to be to reboot. From the man page on acpid (which I assume kacpid is tied to although there doesn't seem to be any doc on kacpid) its not clear to me that acpid is necessary. My question is: where might I look to see what is triggering this uncivilized behaviour and what is kacpid 'doing'? TIA, Patrick