Fix Universal Serial Bus (USB) Controller Driver Issue. A yellow exclamation mark next to Universal Serial Bus (USB) Controller means the device driver is not installed correctly. In that case, your USB devices cannot be recognized by PC. But don’t worrry. There are three methods for you to fix this issue. Even though it doesn't specifically say anywhere, the SM Bus Controller driver is bundled with the Graphics Chipset Drivers. I only found this out after installing. The Asus SMBus Controller manages many low-speed computer functions, such as the computer battery and temperature sensors. Drivers for system components, such as the SMBus, are installed at the factory. If the operating system reports that the SMBus driver for Asus is corrupt or conflicting with other devices, you can quickly resolve the issue using the Device Manager utility in Windows. Fix Universal Serial Bus (USB) Controller Driver Issue. A yellow exclamation mark next to Universal Serial Bus (USB) Controller means the device driver is not installed correctly. In that case, your USB devices cannot be recognized by PC. But don’t worrry. There are three methods for you to fix this issue. I keep getting 'SM Bus Controller is not installed' message for my PC under the 'Device and Printers' menu from the Control panel. I have installed the latest chipset drivers for my MB from the Asus driver/support page.

-->

A bus driver services a bus controller, adapter, or bridge (see the Possible Driver Layers figure). Microsoft provides bus drivers for most common buses, such as PCI, PnpISA, SCSI, and USB. Other bus drivers can be provided by IHVs or OEMs. Bus drivers are required drivers; there is one bus driver for each type of bus on a machine. A bus driver can service more than one bus if there is more than one bus of the same type on the machine.

The primary responsibilities of a bus driver are to:

Enumerate the devices on its bus.
Respond to Plug and Play IRPs and power management IRPs.
Multiplex access to the bus (for some buses).
Generically administer the devices on its bus.

Bus drivers are essentially function drivers that also enumerate children.

During enumeration, a bus driver identifies the devices on its bus and creates device objects for them. (For information about device objects, see Device Objects and Device Stacks.) The method a bus driver uses to identify connected devices depends on the particular bus.

A bus driver performs certain operations on behalf of the devices on its bus, including accessing device registers to physically change the power state of a device. For example, when the device goes to sleep, the bus driver sets device registers to put the device in the proper device power state.

Note, however, that a bus driver does not handle read and write requests for the child devices that are connect to its bus. Read and write requests to a child device are handled by the child device's function driver does the parent bus driver handle reads and writes for the device.

Because a bus driver acts as the function driver for its controller, adapter, or bridge, it also manages device power policy for these components.

What Is An Sm Bus Controller Driver For Dell

A bus driver can be implemented as a driver/minidriver pair, the way a SCSI port/miniport driver pair drives a SCSI host bus adapter (HBA). In such driver pairs, the minidriver is linked to the second driver, which is a DLL.

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.

Bus Controller Driver Windows 7

What Is The Bus Controller Driver For Mac

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.

Universal Serial Bus Controller

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.