---
name: "acpitimer"
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/acpitimer"
---

# acpitimer(4)

ACPI power management timer

## NAME

**acpitimer** – ACPI power management timer

## SYNOPSIS

**acpitimer\* at acpi?**

## DESCRIPTION

The **acpitimer** driver allows access to a power management timer through ACPI. The timer is used as a timecounter for the tc\_init(9) framework.

## SEE ALSO

[acpi(4)](/acpi/4.md), [intro(4)](/intro/4.md), tc\_init(9)

## HISTORY

The **acpitimer** driver first appeared in OpenBSD 3.8.

## AUTHORS

The **acpitimer** driver was written by Thorsten Lockert ⟨*tholo@sigmasoft.com*⟩.