Lenovo Notebook: Unknown Device Driver for ACPI\VPC2004 OR ACPI\VEN_VPC&DEV_2004


Reinstalled Windows 7 or Windows 8 or Windows 10 on your Lenovo Notebook and found a driver missing? Then you are not alone. I also experienced the same on our Lenovo Notebook. Once I reinstalled Windows, I downloaded all drivers from Lenovo driver download page and installed. However, one of the device was still showing as Unknown device.


To find more information on this device, I double clicked on the “Unknown device” and checked the “Details” tab for Hardware IDs and found the following:


The Hardware Device IDs are:


These Device IDs belong to Lenovo Energy Management Driver and can be downloaded from the driver download page of your Lenovo Notebook.


Ensure that you download driver from the download page of your Lenovo Notebook. There are different versions of Lenovo Energy Management Driver available and not all versions are compatible with all Lenovo notebooks.

Here, I will provide most common Lenovo Energy Management Driver driver available and works on most of the Lenovo Notebooks. Click here to open the Lenovo driver download page. This driver will work for Windows 7 32 bit and 64 bit.

LENOVO-ENERGY-MANAGEMENT-FOR-WINDOWS-7-32-BIT-64-BITThis driver supported on following Notebook Models:

  • Lenovo G485, G585
  • Lenovo G480 (2184, 20149), G480 (2688, 20156), G580 (2189, 20150), G580 (2689, 20157), G780
  • Lenovo G405, G505, G405s, G505s
  • Lenovo G410, G510, G410s Touch, G510s Touch
  • IdeaPad P580, P585
  • IdeaPad N580, N581, N585, N586
  • IdeaPad Y410p, Y510p

If you are looking for Windows 8 driver download, then you could download it from here. This driver will work for Windows 8 32 bit and 64 bit. You could also try installing the same driver on Windows 8.1.


This driver is compatible with following Notebook models:

  • Lenovo G400, G500, G700
  • Lenovo G400s, G400s Touch, G500s, G500s Touch
  • Lenovo G405, G505
  • Lenovo G405s, G505s
  • Lenovo G410, G510
  • IdeaPad S210, S210 Touch
  • IdeaPad S215
  • IdeaPad S310, S410
  • IdeaPad S415, S415 Touch
  • IdeaPad U330p, U330 Touch, U430 Touch, U430p
  • IdeaPad Y410p, Y510p
  • IdeaPad Yoga 11s

Note: If you are using Lenovo Yoga 2 11 Notebook, then the driver links provided above may not work. Instead, use this driver for Windows 8.1 (64-bit) or use this driver download link for Windows 8 (32-bit and 64-bit)

The device ID ACPI\PC2004 is for the Lenovo Energy Management and this driver can be downloaded from  driver download page of your Notebook. If the driver is not available for your Windows version, please try  using older version of this driver in Compatibility mode.

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Founder and Owner of Tricks Guide. SiRu is a Server Support Specialist, Tech Blogger and a Typical Family Man. If you’d like to connect with him, follow him on Twitter | Facebook | Google+

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