Unknown Device Query method and hardware ID Query method

Unknown devices caused by a variety of reasons, such as power management driver is not installed, and so on, you can use the hardware ID of unknown devices to simply determine the unknown device, power management hardware ID is generally VPC2004, the following figure is looking for hardware ID of the diagram, see:

Right-click the computer, open management

Click Device Manager for Device right-click Properties-Details-Hardware ID (XP for device instance ID)

To query related hardware through Ven and Dev's code

Query Address: http://www.pcidatabase.com/