Locate (usually under "Other devices" with a yellow exclamation mark). Right-click it and select Update driver .

Download and install the (or AMD equivalent). Restart your computer to complete the update.

Download the .exe file, run it as Administrator, follow the on-screen prompts, and . Upon reboot, check Device Manager. The yellow exclamation mark should be gone, and "SM Bus Controller" should now appear under "System Devices" with a working driver.

Every Dell computer features a unique 5- to 7-character alphanumeric code called a Service Tag.

Finding a yellow exclamation mark next to the in your Windows 10 64-bit Device Manager is a common issue for Dell users, especially after a fresh OS installation. This error indicates that the System Management Bus driver—responsible for managing motherboard voltage, temperature, and low-speed communication between system components—is missing or unrecognized.

If Windows finds a suitable driver, it will install it automatically. Restart your PC if prompted.

Right-click the SM Bus Controller in Device Manager and select Update driver