VirtualBox piix4_smbus Error

VirtualBox 3.2.10 gives me the following error message when booting Ubuntu 10.10:
piix4_smbus 0000.00.07.0: SMBus base address uninitialized - upgrade bios or use force_addr=0xaddr

This error is caused by VM having no smbus but Ubuntu always trying to load the module. It doesn’t affect anything but is a bit annoying – to fix: -

1. Check module is being loaded: -

lsmod | grep i2c_piix4

2. If so, blacklist it in /etc/modprobe.d/blacklist.conf, by adding the following to the end of the file :-

blacklist i2c_piix4

3. Update the initramfs

update-initramfs -u -k all