---
title: kIOVideoFeatureControlClassIDPowerLineFrequency
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1646200-anonymous/kiovideofeaturecontrolclassidpowerlinefrequency
---

# kIOVideoFeatureControlClassIDPowerLineFrequency

## Declaration

```occ
kIOVideoFeatureControlClassIDPowerLineFrequency = 'pwfq'
```

## Discussion

Discussion A IOVideoFeatureControl to specify the power line frequency to properly implement anti-flicker processing. The units for the contorl's absolute value are hertz (Hz).