Comment 27 for bug 440470

I have the exact same error in my dmesg:
...
[ 17.069168] nvidia: module license 'NVIDIA' taints kernel.
[ 17.069173] Disabling lock debugging due to kernel taint
[ 17.102603] ACPI: I/O resource nForce2_smbus [0x4c00-0x4c3f] conflicts with ACPI region SM00 [0x4c00-0x4c05]
[ 17.102653] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 17.102657] nForce2_smbus 0000:00:0a.1: Error probing SMB1.
[ 17.102737] i2c-adapter i2c-0: nForce2 SMBus adapter at 0x4c40
[ 17.106484] k8temp 0000:00:18.3: Temperature readouts might be wrong - check erratum #141
...

My system is an Asus M2NPV-VM with a dual core AMD Athlon X2 and I'm running the 64 bit OS:
$ sudo uname -a
Linux Study 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux

Attached is my dmidecode output in the hope it is helpful to those debugging.