SM Bus Controller and It’s Drivers

The System Management Bus (often shortened to SM Bus, SMBus or SMB) controller is a single-ended, a two-wire bus that is fairly simple and is designed for the purpose of lightweight communication. The SM Bus Controller is a component that enables efficient and seamless communication between a computer and some of its most integral hardware components such as its Power Supply Unit (PSU) and its cooling fans. The SM Bus Controller basically allows a computer to successfully handle and execute commands such as turning its Power Supply Unit on or off and controlling its cooling fans.

However, the functionality of the SM Bus Controller does not end at simply allowing an Operating System to communicate with and control hardware components such as PSUs and cooling fans. The SM Bus Controller can also be used by a computer for monitoring purposes as many laptop computers use their SM Bus Controllers to keep their battery and temperature levels in check. In addition, the SM Bus Controller also has a lot of potential to be adapted to a number of other purposes, as evidenced by the fact that some developers have managed to use it to load and install firmware onto devices more easily.

How to update your SM Bus Controller drivers

If the drivers for a computer’s SM Bus Controller are installed properly and the component is working as it should, it is almost entirely unnoticeable. However, if that is not the case, the SM Bus Controller shows up in the Device Manager of the computer in question, along with an exclamation mark that basically indicates that the SM Bus Controller itself or its drivers are not installed appropriately. While this is not a particularly major issue on most computers, constantly being reminded of the fact that their SM Bus Controller or its drivers are not installed correctly can be quite irritating for the average computer user.

Thankfully, fixing this issue and getting your SM Bus Controller to go back to the way it previously was (being unnoticeable by taking on the label and appearance of the monitored devices it is connecting to) is quite easy. All you need to do is update your SM Bus Controller’s drivers to the latest version, and the following are the two methods that you can use to do so:

Download the latest chipset drivers from the manufacturer’s official website

Find out the model of your computer’s motherboard and who manufactured it. If it was not a custom build, then you can easily get the drivers by going to the manufacturer’s website and keying in the model # of your system. The model number is usually located at the front or the back.


Go to the Support, Products or Downloads page of the official website of your motherboard’s manufacturer.

Look up your motherboard’s model number, and you should see a list of all the latest available drivers for your motherboard. For example, this is a web page that lists all of the latest available drivers for the Gigabyte GA-H81M-DS2V

Download and install all the latest Chipset drivers for your motherboard.

Once you have installed the latest Chipset drivers, the SM Bus Controller (and the exclamation mark on it) should disappear from the Device Manager and you should no longer receive any reminders or warning messages.


Kevin Arrows

Kevin Arrows is a highly experienced and knowledgeable technology specialist with over a decade of industry experience. He holds a Microsoft Certified Technology Specialist (MCTS) certification and has a deep passion for staying up-to-date on the latest tech developments. Kevin has written extensively on a wide range of tech-related topics, showcasing his expertise and knowledge in areas such as software development, cybersecurity, and cloud computing. His contributions to the tech field have been widely recognized and respected by his peers, and he is highly regarded for his ability to explain complex technical concepts in a clear and concise manner.
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