I hate to ask this but are you sure this isn't a hardware issue? Have you tried kernels from any other distros or maybe even run another OS that you know detects it as smp? I know some of the early HT Pentiums have issues. Thanks for your report.
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Needs Info
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Fail to boot smp kernel
https://launchpad.net/bugs/24533
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