A yellow warning icon in front of it indicates that the SM Bus Controller is not installed or the driver is not installed correctly. If you see a question mark in front of the SM Bus Controller, it indicates that the hardware is not recognized by Windows. Its main purpose is to monitor the voltage and temperature of the motherboard. The SM Bus Controller is a chipset on the motherboard.
After reading this post, you should be able to fix it on your own quickly & easily! What is the SM Bus Controller? Are you feeling upset when you see a yellow warning icon or a question mark next to SM Bus Controller in Device Manager? Don’t worry, it is most likely a driver issue.
