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


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


The above symptom may occur on the following systems:

All Ideapad and Essentials laptops


Download and run the Energy Management from Lenovo support website with the proper Operating System version.

This will install the chipset INF files so that Windows properly recognizes the virtual power controller ACPI/VPC2004.

Visit the following site to download the Energy Management for your machine:

If you are unable to find what you are looking for, please do try the following options:
1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

Alias ID : IN20100524-007
Document ID : HT071645
Legacy Document ID : IN20100524-007
Last Updated : 16 May 2014
Copyright © Lenovo 2013, all rights reserved
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