Hello, and welcome!
This dmesg tells us quite a bit, since it lays out your hardware for us. I note that your system is using a DFI "LanParty" NP4 series motherboard, with what appears to be an up-to-date BIOS, if I understand that the same "Revision A" BIOS was packaged in both March and again in April of 2006. DFI's website isn't completely clear.
If the problem only occurs with the MP kernel, please report that when you are able to post to the mailing list. That information should help.
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