Acpi\ven_vpc&dev_2004 - [patched]
The fix is simple but specific: You need the . Once installed, VPC2004 wakes up, the yellow exclamation mark vanishes, and your Function keys, fan controls, and battery conservation modes come back to life.
If you see (often shortened to ACPI\VPC2004 ) listed as an "Unknown Device" in your Windows Device Manager, it means your system is missing the Lenovo Energy Management driver.
The combination of VEN_VPC and DEV_2004 specifically identifies a device made by VPC (which could be a less commonly referenced vendor in mainstream documentation) with the device ID of 2004.
The fix is simple but specific: You need the . Once installed, VPC2004 wakes up, the yellow exclamation mark vanishes, and your Function keys, fan controls, and battery conservation modes come back to life.
If you see (often shortened to ACPI\VPC2004 ) listed as an "Unknown Device" in your Windows Device Manager, it means your system is missing the Lenovo Energy Management driver.
The combination of VEN_VPC and DEV_2004 specifically identifies a device made by VPC (which could be a less commonly referenced vendor in mainstream documentation) with the device ID of 2004.
