No, I have not open a bug in bugzilla. I don't have a bugzilla account (yet!).
If you open a bug, please post the number so I can track it.
In the mean time, I found this bug report: https://bugzilla.redhat.com/bugzilla....cgi?id=163355
, which is related to FC5, so they were aware of this problem, but I don't think they have a solution so far.
I did the same and I am using kenel 1398. I tried every possible combination in /boot/config*1447* (ACPI Section), with no results, so the problem must be somewhere else. I am a newbi in these things so I stopped there.