---
title: kIOFBNotifyWillChangeSpeed
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1638125-anonymous/kiofbnotifywillchangespeed
---

# kIOFBNotifyWillChangeSpeed

## Declaration

```occ
kIOFBNotifyWillChangeSpeed = 9
```