---
name: "acpi_apple"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/acpi_apple"
---

# acpi\_apple(4)

Apple platform ACPI driver

## NAME

**acpi\_apple** – Apple platform ACPI driver

## SYNOPSIS

**device** **acpi\_apple** **device** **backlight**

## DESCRIPTION

The **acpi\_apple** driver attaches to Apple platform ACPI devices found on Intel-based Macs and provides two independent functions through a single driver, selected by the ACPI hardware ID it matches:

- APP9876, APP000B

  Platform instance. Attaches to the PCH PMC companion (T2 Macs, 2018 and later) or the GMUX GPU multiplexer companion (Intel Macs with discrete graphics, 2006-2020). Arms Wake-on-LAN on shutdown for any interface with wake enabled (e.g. *dev.bge.N.wake=1*), and follows the ACPI lid switch, blanking the backlight when the lid is closed and restoring it when the lid is reopened.

- APP0002

  Backlight instance. Controls the panel backlight found on all Intel Macs with an internal display, and registers with the [backlight(9)](/backlight/9.md) framework. The correct control method is selected automatically.

APP0001 (SMC companion) is intentionally not claimed by this driver; it is owned by [asmc(4)](/asmc/4.md).

## HARDWARE

The **acpi\_apple** driver supports the Apple ACPI devices found in the DSDT of Intel-based Macs:

- APP9876, the PCH PMC companion, present on T2 Macs (2018 and later).

- APP000B, the GMUX GPU multiplexer, present on Intel Macs with discrete graphics (2006-2020), including single-GPU Mac minis.

- APP0002, the panel backlight, present on all Intel Macs with a built-in display.

## SEE ALSO

[acpi(4)](/acpi/4.md), [asmc(4)](/asmc/4.md), [backlight(9)](/backlight/9.md)

## HISTORY

The **acpi\_apple** driver first appeared in FreeBSD 16.0.

## AUTHORS

Abdelkader Boudih ⟨*seuros@FreeBSD.org*⟩