May 28 13:56:48 Tower kernel: i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
May 28 13:56:48 Tower kernel: i801_smbus 0000:00:1f.3: Transaction timeout
May 28 13:56:48 Tower kernel: i801_smbus 0000:00:1f.3: Failed terminating the transaction
May 28 13:56:48 Tower kernel: i801_smbus 0000:00:1f.3: SMBus is busy, can't use it!
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ad naseum
OTOH, I'd try updating your bios since it looks to be a couple of revs old