---
name: "abl"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/abl/4"
---

# abl(4)

Apple backlight support

## NAME

**abl** – Apple backlight support

## SYNOPSIS

**abl\* at acpi?**

## DESCRIPTION

The **abl** driver enables access to the backlight found in Intel based Apple iMac computers. It provides brightness control using the [wsconsctl(8)](/wsconsctl/8.md) variable *display.brightness*.

## SEE ALSO

[acpi(4)](/acpi/4.md), [intro(4)](/intro/4.md), [wsconsctl(8)](/wsconsctl/8.md)

## HISTORY

The **abl** driver first appeared in OpenBSD 6.8.

## AUTHORS

The **abl** driver was written by Marcus Glocker ⟨*mglocker@openbsd.org*⟩.