Acpi\ven_len&dev_4001

If this device appears in Device Manager with a yellow exclamation mark, the system is missing one of the following software packages:

– it’s a legitimate Lenovo ACPI device. Install Lenovo’s official Power Management driver for your exact model to clear the missing driver flag. If you don’t care about advanced power features, you can safely disable or ignore it. acpi\ven_len&dev_4001

If building custom operating system images or running clean environments, pull the files manually: If this device appears in Device Manager with