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      Unknown Device in the device manager, code is ACPI/VPC2004

      Symptom:

      Windows does not recognize the device in the device manager, the device has a code ("Device ID") ACPI/VPC2004.

      AFFECTED CONFIGURATIONS:

      The above symptom may occur on the following systems:
      All Ideapad and Essentials laptops

      SOLUTION:

      Download and run Energy/power Management or OneKey Optimizer from Lenovo support website with the proper Operating System version.
      This will install the chipset INF files so that Windows will properly recognizes the virtual power controller ACPI/VPC2004.

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      • Alias ID: IN20100524-007
      • Document ID: HT071645
      • Last Updated :28 Dec 2015
      • © 2015 Lenovo