---
name: "acpials"
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/acpials"
---

# acpials(4)

ACPI ambient light sensor

## NAME

**acpials** – ACPI ambient light sensor

## SYNOPSIS

**acpials\* at acpi?**

## DESCRIPTION

The **acpials** driver supports ACPI ambient light sensor devices and provides information about the ambient light environment in which the system is currently operating. Ambient light illuminance is read every second and can be monitored using [sysctl(8)](/sysctl/8.md) or [sensorsd(8)](/sensorsd/8.md).

## SEE ALSO

[acpi(4)](/acpi/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **acpials** driver first appeared in OpenBSD 6.1.

## AUTHORS

The **acpials** driver was written by joshua stein ⟨*jcs@openbsd.org*⟩.