---
name: "pmc"
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/pmc/4"
---

# pmc(4)

power management controller

## NAME

**pmc** – power management controller

## SYNOPSIS

**pmc\* at ebus?**

## DESCRIPTION

The **pmc** driver provides support for the watchdog feature of the power management device of the National Semiconductor PC87317 SuperIO chip found on UltraSPARC III systems.

The watchdog timer provides a standard [watchdog(4)](/watchdog/4.md) interface, and has a granularity of 60 seconds.

## SEE ALSO

[bbc(4)](/bbc/4.md), [intro(4)](/intro/4.md), [watchdog(4)](/watchdog/4.md)

## HISTORY

The **pmc** driver first appeared in OpenBSD 4.2.

## AUTHORS

The **pmc** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.