Fn key not working after format

October 2016

The function keys allow you to perform special tasks in Windows applications. These keys execute diverse functions based on what program you are using. The Sony VAIO laptop computer allows you to control settings specific to the laptop computer with Fn shortcuts. The Fn key can be used in conjunction with another function key to adjust brightness, switch monitors, magnify the screen and alter other hardware settings. VAIO laptops use the ACPI (Advanced Configuration and Power Interface) function to control the hardware access like brightness or volume control. Installing or upgrading Windows operating system can disable the Fn key requiring you to reinstall some drivers. You need to install and activate ACPI drivers which make hardware status information available to the operating system for the Fn key to work.


I formatted my Vaio laptop. After formatting, its fn key not working.


This should help, I had the same problem where I could not use my Fn key to adjust volume or brightness and this solution worked for me.
  • In your 'Start' menu click on 'Run' and type in services.msc
  • You'll see a long list called Services (Local), click on the name parameter to have them sorted alphabetically.
  • Find the one called VAIO Event Service. Double click this and ensure that for Startup Type it says 'automatic', if it does not, change it to 'automatic' and click 'apply'.
  • Then be sure below that, that the Service Status says 'Started'.


Thanks to JustHelp for this tip on the forum.

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