I am running fedora 13 and tested kernel-2.6.34 from http://koji.fedoraproject.org/koji/packageinfo?packageID=8
With the .34 kernel kacpid consumes 100% CPU. This seems to be a known regression. The patch above is from https://bugzilla.kernel.org/show_bug.cgi?id=15924
The issue was solved for me with a patched 188.8.131.52-46.2.7.rc1.fc14 kernel.
But it seems that the patch isn't working with kernel-184.108.40.206-9.fc13.
If you need more information feel free to ask.
Thank you for the bug report. This particular bug has already been reported into our bug tracking system, but please feel free to report any further bugs you find.
Fedora Bugzappers volunteer triage team
*** This bug has been marked as a duplicate of bug 613412 ***