Knowledge Base

Why does my unit not recognize the SMBus Controller?

More information regarding this issue is available from Intel's website.


  • Windows does not recognize the SMBus controller.
  • Device Manager shows a yellow question mark for the SMBus controller.
  • Device Manager lists the SMBus controller under Other Devices.


SMBus is the System Management Bus defined by Intel in 1995. It is used in personal computers and servers for low-speed system management communications. An SMBus controller is integrated into most Intel® chipsets.


Download the latest chipset driver from Cybernet. This will install the chipset INF files so that Windows properly recognizes the chipset's built-in SMBus controller.