flooded by acpi_perf0: invalid _PSS package

Hello,

On my Sempron 3000+ machine running FreeBSD-6.0-BETA5/i386 dmesg gets
flooded by 264 consequent lines of:

  acpi_perf0: invalid _PSS package

The system appears to work fine though (I haven't tested any ACPI
specific stuff though, it's a headless server). Is there something you
or I can do about it? If the messages are really harmless, maybe they
could be supressed?

For reference, Jiawei Ye reported the same thing a couple of months ago,
there were no answers though:

http://marc.theaimsgroup.com/?l=freebsd-current&m=112139473031906&w=2

Cheers
Benjamin