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Having said the above, if you suspect an acpi or apic problem, the URL: http://fedoraproject.org/wiki/KernelCommonProblems says, "acpi=off is a big hammer, and if that works, narrowing down by trying pci=noacpi instead may yield clues" It also says, "nolapic and noapic are sometimes useful"
A quick update. I tried the acpi=no option and so far, so good. I have even brought it back into X windows and ran some yum updates to apply some stress. I'll leave it in this state until tomorrow evening just to make sure. Then I'll try the smaller hammers.
Question showing my ignorance of what acpi is. If pci=noacpi works or does not work, what clues is that giving me?
I didn't respond earlier because we've reached my level of ignorance too.
If I were you, I might try to narrow the problem a little further.
Eventually I would write a Bugzilla bug report telling the maintainers the symptoms, what I had done, including things that didn't work as well as things that seemed to work.
If I had a workaround, I wouldn't expect much help from a maintainer because I would assume they have other problems to solve where a workaround is not known.
If my Bugzilla bug report happened to be in an area a maintainer was already digging in, the maintainer might take an interest and ask me to do things to help gather more information.