This make three months in a row where "sm bus controller" is
one of the most searched for items on this site. The Windows install disk
doesn't install the drivers for the sm bus controller. For all
of you that are searching for this you did NOT install your chipset drivers yet!
To get any kind of decent performance out of windows you will want to be running
fairly up to date drivers of everything in your computer starting with your
chipset and video card.
What is it?
Systems Management Bus. If you'd like some real tech documents
about this you'll want to visit smbus.org.
The less detailed explanation was found on
System Management Bus - (SMBus, SMB) A simple two-wire
bus used for
communication with low-bandwidth devices on a motherboard, especially power
related chips such as a laptop's rechargeable battery subsystem (see
Smart Battery Data). Other devices might include temperature sensors and lid
A device can provide manufacturer information, indicate its model/part number,
save its state for a suspend event, report different types of errors, accept
control parameters, and return status. The SMB is generally not user
configurable or accessible.
The bus carries clock, data, and instructions and is based on Philip's I2C
serial bus protocol. Support for SMBus devices is provided on
98 does not support such devices.
The PIIX4 chipset provides SMBus functionality. Vendors using SMBus would be
required to pay royalties.
I've only found references to the SMBus on Intel chipsets, but I'll provide
links to a lot of other chipset drivers just in case.