A sm bus controller has nothing to do with Video/Graphics (the forum where you posted).
Sometimes questions go un-answered when:
1. the question may be unclear or we cannot determine what it is that you are asking for.
2: The hardware in question is unknown or inadequately described.
3. the question seems to request an answer for something that cannot be explained online adequately.
4. the Experts that are online simply don't have the resources to answer your question fully.
Please feel free to re-word your question or add additional information you might feel helpful for the Experts to assist you. Be sure to identify the computer/motherboard by brand and model (that this device came installed in). If you're unable to do so, then I suggest using this program:
To find make and model of pc hardware, EVEREST Home Edition
is a free system diagnostics, system information program that will id most hardware onboard a mb. as well as the actual motherboard. It will, in some cases, actually provide a download link for the driver.
Alternate Everest download link: (offers 2 sites to dl program from)
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is BLUE
this is a link to the web site for that particular hardware.
If you have additional questions or need further help, please post a "copy and paste" of the COMPUTER SUMMARY report (Leave out the Debug–PCI section) from Everest.