SM Bus - System Management Bus. This is part of the chipset, and, as such, controller and driver issues for it are resolved by installing (or updating) your motherboard chipset drivers. Computer Repair Technician. System Management Bus: (SMBus, SMB) A simple two-wire bus used for communication with low-bandwidth devices on a motherboard, especially power related chips such as a laptop's rechargeable battery subsystem (see Smart Battery Data). Other devices might include temperature sensors and lid switches. It means SM Bus Controller Driver is missing. You can found a yellow! Mark over the SM Bus Controller shown in Device Manager. Usually this is an easy-to-fix issue. Just go with the tried-and-true ways below, you can fix it at once. Note: SM Bus, short for System Management Bus, is part of the chipset.

After you upgrade or roll back your operating system, a yellow exclamation point displays next to SM Bus Controller in Windows Device Manager. A Cannot Install this Hardware message might also display.

note:

This document pertains to a problem with the driver for the SM Bus Controller. If you are looking for driver downloads, see Obtaining Software and Drivers.

When you upgrade or change Windows to another version, the drivers for the chipset might not install correctly. This causes Windows Device Manager to display the problem with SM Bus Controller.

Figure : Exclamation point next to SM Bus Controller in Device Manager

Follow these steps to resolve the issue.

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Make sure that your computer is connected to the Internet.
- Windows 7 and Windows Vista - Click Start , and then type Device Manager into the into the Start field. Click Device Manager from the search results.
- Windows XP - Click Start, right-click My Computer, click Properties, select the Hardware tab, and then click Device Manager.
Click the plus sign next to System Devices, and then find the SM Bus Controller entry.
note:
If you do not see an SM Bus Controller entry, your computer does not have an SM Bus Controller or it is not recognizing the controller. Restart the computer and perform these steps again. If you still do not see an SM Bus Controller entry, your computer does not have an SM Bus Controller.
Right-click SM Bus Controller, and then select Update Driver. Follow the instructions to update the driver software.
- If these steps resolved the issue, you do not need to continue troubleshooting.
- If the computer did not find or install the correct driver, continue with the next step.
- Windows 7 and Windows Vista - Click Start , and then type dxdiag into the into the Start field. Click dxdiag or dxdiag.exe from the search results.
- Windows XP: Click Start, click Run, type dxdiag in the Open text box, and then press Enter.
Click the Display tab.
Find your chipset information in the Device section.
Figure : Chipset information in the DirectX Diagnostic Tool
Open a Web browser window, and then navigate to a Web search page, such as Google or Yahoo.
note:
Check the Related Links section of this document for links to some of the most common chipset manufacturers' Web sites.
Type the full name of your chipset in the search text field, and then press Enter. Use the search results to go to the official Web page of the chipset manufacturer. Browse to the driver download page, and then follow the manufacturer's instructions to download and install the drivers for your chipset.

Hp Sm Bus Controller Driver

Hi,
We recommend you to uninstall the bus controller driver from the list of device manager. To do this, follow these steps.
1. Click Start, type devmgmt.msc and hit enter.
2. From the list of items, right click on the driver item and click uninstall.
3. Restart the computer for the changes to take effect.
4. The driver should be installed automatically after system restart.

Updating the chipset driver should help. To do this, try these steps.
1. Click Start, type devmgmt.msc and hit enter.
2. From the list of items, expand Processors.
3. Right click the sub item and click update driver.

What Is Sm Bus Controller Driver

For more information on 'Update a driver for hardware that isn't working properly' check this link: http://windows.microsoft.com/en-us/windows-vista/Update-a-driver-for-hardware-that-isnt-working-properly
For more information on 'driver not working' and 'hunt for drivers' check these links.
1. Update a driver for hardware that isn't working properly:
http://windows.microsoft.com/en-us/windows-vista/Update-a-driver-for-hardware-that-isnt-working-properly
2. The hunt for drivers:
http://windows.microsoft.com/en-US/windows-vista/The-hunt-for-drivers-How-to-find-Windows-Vista-drivers-for-all-your-hardware
Hope this helps.
Regards,
Syed
Microsoft answers support engineer.