If you have upgraded to Windows 10 or performed a clean install, you likely need to download and reinstall this service to restore full functionality to your device. Where to Download VAIO Event Service Manager
Sony typically provides the VAIO Event Service as part of a larger package called . You should avoid third-party "driver update" sites and stick to official sources: Function keys are not working. | Sony AP vaio event services manager download windows 10
How to Download and Install VAIO Event Service for Windows 10 If you have upgraded to Windows 10 or
The is a critical background utility for Sony VAIO laptops that manages hardware-specific events, such as Fn (Function) key commands , screen brightness adjustments, and volume controls. Without this service, your laptop might feel "broken," even if the hardware is fine, because the software bridge between the keyboard and the Windows 10 operating system is missing. | Sony AP How to Download and Install