Here’s exactly how to fix it. Windows 10 does a great job finding generic drivers, but Sony Vaio laptops use a custom embedded controller (EC). The standard HID (Human Interface Device) driver can’t interpret the special signals from your Fn key combos.
Struggling with volume, brightness, or WiFi keys on your Sony Vaio after upgrading to Windows 10 64-bit? Here is exactly how to find, install, and fix the Function Key driver. Sony Vaio Function Keys Driver Windows 10 64 Bit
sony-vaio-function-keys-driver-windows-10-64bit If you’ve recently upgraded your trusty Sony Vaio laptop to Windows 10 (64-bit) —or performed a clean installation—you’ve probably noticed one frustrating issue: the Function (Fn) keys no longer work. Here’s exactly how to fix it