There are three safe methods to get this driver. —they often bundle malware or incorrect drivers.

can scan your system and install the missing driver for you. SupportAssist

If the problem persists, ensure you have restarted your computer. Then, verify the chipset driver was installed correctly. You can also check the "Optional updates" section of Windows Update, where Microsoft sometimes distributes manufacturer drivers. Finally, consider resetting your BIOS to its default settings from the UEFI firmware interface, as this can sometimes help clear a detection conflict.

Dell modifies reference designs from Intel, AMD, or NVIDIA. The SM Bus Controller on a Dell Latitude 5490 uses a different hardware ID than the one on a Dell XPS 8930. Windows 10’s generic driver does not recognize Dell’s specific PCI vendor IDs (VEN_8086, VEN_1022, etc.) combined with Dell’s subsystem IDs (SUBSYS_1028...).

In this guide, we will walk you through exactly what the SM Bus Controller is, why it’s missing, and the three best methods to download and install the correct driver for your Dell running Windows 10 64-bit.

SM Bus stands for . It is a lightweight, two-wire interface based on I²C (Inter-Integrated Circuit). In simple terms, it is the "nervous system" that allows the motherboard to talk to low-bandwidth devices.

The safest and most reliable way to fix this issue is to fetch the driver directly from Dell. Dell customizes its motherboard chipsets, and using their repository ensures absolute system stability. Step 1: Find Your Dell Service Tag

In rare instances, the driver may install successfully but revert to a yellow exclamation mark after a restart. This issue is often caused by a corrupted driver entry in the Windows Registry or a conflict with a previously installed driver. The solution is as follows:

The easiest way to find the exact driver for your specific Dell model is through official Dell tools.