ACPI controller

Hello dear friends! I have a laptop (Lenovo G780) in device Manager has a yellow icon in the string Unknown device.
Poke the properties - device status - device the drivers are not installed(code 28), the location of the Microsoft/ACPI-compliant embedded controller.

Tell me how serious this is and if so, where can I find this driver (all Internet rummaged - did not find). If not, you can just ignore this problem? Please tell me!