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. After reading this post, you should be able to fix it on your own quickly & easily!

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• .Includes the following version of of the Windows operating system: Windows 7, Windows Server 2008 R2 and Windows 8, 8.1, Windows server 2012 R2, Windows Server 2016 and Windows 10. Also, as Windows 8 RT is a closed system not allowing for 3rd party driver installation our Windows 8 driver will not support this variant of the OS.
• Realtek High Definition Audio Driver 2.82 on 32-bit and 64-bit PCs. This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system on a laptop or desktop PC from drivers without restrictions. Realtek High Definition Audio Driver 2.82 is available to all software users as a free download for Windows.
• USB Driver Updates. Need USB Driver Downloads for Windows 10, Windows 8, Windows 7, Vista and XP? If you are having problems with your USB not working, read the article below to help fix your USB problems. USB issues often, but not always, relate to drivers problems.

What is the SM Bus Controller?

The SM Bus Controller is a chipset on the motherboard. Its main purpose is to monitor the voltage and temperature of the motherboard. If you see a question mark in front of the SM Bus Controller, it indicates that the hardware is not recognized by Windows. A yellow warning icon in front of it indicates that the SM Bus Controller is not installed or the driver is not installed correctly.

There are two ways to update your SM Bus Controller driver:

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Method 1 – Download and install the driver manually

Intel keeps updating drivers. To get them, you need to go to Intel’s official website, find the drivers corresponding with your specific flavor of Windows version (for example, Windows 32 bit) and download the driver manually.

Once you’ve downloaded the correct drivers for your system, double-click on the downloaded file and follow the on-screen instructions to install the driver.

Method 2: Automatically update your drivers

If you don’t have the time, patience or computer skills to update the driver for your SM Bus Controller manually, you can do it automatically with Driver Easy.

Driver Easy will automatically recognize your system and find the correct drivers for it. You don’t need to know exactly what system your computer is running, you don’t need to risk downloading and installing the wrong driver, and you don’t need to worry about making a mistake when installing.

You can update your drivers automatically with either the FREE or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (and you get full support and a 30-day money back guarantee):

1. Download and install Driver Easy.
2. Run Driver Easy and click Scan Now. Driver Easy will then scan your computer and detect any problem drivers.
   
3. Click Update next to the device whose name contains “SM Bus Controller” to automatically download the correct version of this driver, then you can install it manually. Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system (this requires the Pro version – you’ll be prompted to upgrade when you click Update All).
   

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The HD Audio bus driver is the only software component that directly accesses the hardware registers of the HD Audio bus interface controller. The bus driver exposes the HD Audio DDI that its children--instances of the function drivers that control the audio and modem codecs--can use to program the HD Audio controller hardware. In addition, the bus driver manages the HD Audio Link hardware resources, which include the DMA engines and bus bandwidth. Function drivers allocate and free these resources through the HD Audio DDI.

The HD Audio bus driver:

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• Queries the codecs on the bus and creates children to manage the codecs.

• Handles interrupt service routines (ISRs) for unsolicited responses and propagates the unsolicited responses to its children.

• Passes commands from its children to the codecs and retrieves responses from the codecs.

• Sets up the DMA engines that transfer data to or from the cyclic buffers.

• Manages bus bandwidth resources on the HD Audio Link.

• Provides access to the wall clock register and link position registers.

• Provides synchronized starting and stopping of groups of streams.

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The HD Audio bus driver does not provide:

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• An interface for programming a DSP or additional registers that are not defined in the Intel High Definition Audio Specification.

• Prioritized bandwidth management.

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During device enumeration, the HD Audio bus driver detects the codecs that are attached to the HD Audio controller's HD Audio Link. For each codec, the bus driver loads one function driver (if available) for each function group that it finds within the codec. For information about function groups, see the Intel High Definition Audio Specification at the Intel HD Audio website.