Because Dell bundles it. Look for or AMD Chipset Drivers . That package contains the SM Bus driver.
If you can't find the specific download, you can often point Windows to the right generic driver already on your system: sm bus controller driver windows 10 64 bit dell
He closed the laptop, smiled, and whispered, “Thanks, Dell. Even when you break, you’re still worth fixing.” Because Dell bundles it
To verify that the SM Bus Controller driver has been successfully installed: Dell. Even when you break
Let us know in the comments below which method worked for your Dell model!