> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/man/man4/pmu.4.md).

# pmu.4

`pmu` — Apple PMU99 电源管理驱动

## 名称

`pmu`

## 概要

`要将此驱动编译进内核，请在你的内核配置文件中加入以下行：`

> device adb device pmu

## 描述

`pmu` 驱动为 Apple Core99 硬件中的电源管理单元（PMU）提供支持。这包括晚期 G3 笔记本、所有 G4 机器、早期 G5 台式机和所有 G5 XServe。

Apple PMU 控制器是一款多用途 ASIC，提供电源管理和热控制，以及用于笔记本内置键盘和鼠标的 ADB 总线。

## 硬件

`pmu` 驱动支持的芯片包括：

* Apple KeyLargo PMU
* Apple K2-KeyLargo PMU

## SYSCTL 变量

`pmu` 驱动除提供 [adb(4)](https://github.com/FreeBSD-Ask/freebsd-man-sc/tree/main/man4/adb.4.powerpc.md) 接口外，还提供电源管理服务。以下 sysctl 可用于控制电源管理行为以及检查当前系统电源和散热状况。

**`dev.pmu.%d.server_mode`** 断电后重启行为（1 表示系统在断电后重启，0 表示系统保持关闭）。

**`dev.pmu.%d.batteries.%d.present`** 指示相关电池是否已插入。

**`dev.pmu.%d.batteries.%d.charging`** 指示电池当前是否正在充电。

**`dev.pmu.%d.batteries.%d.charge`** 当前电池电量，以毫安时为单位。

**`dev.pmu.%d.batteries.%d.maxcharge`** 电池自报的最大电量，以毫安时为单位。

**`dev.pmu.%d.batteries.%d.rate`** 流入电池的电流，以毫安为单位。电池放电时，此值为负。

**`dev.pmu.%d.batteries.%d.voltage`** 电池电压，以毫伏为单位。

**`dev.pmu.%d.batteries.%d.time`** 电池充满（或放完）的估计时间，以分钟为单位。

**`dev.pmu.%d.batteries.%d.life`** 电池当前电量占最大电量的比例，以百分比表示。

## 参见

[acpi(4)](/man/man4/acpi.4.md), [adb(4)](https://github.com/FreeBSD-Ask/freebsd-man-sc/tree/main/man4/adb.4.powerpc.md), [led(4)](/man/man4/led.4.md)

## 历史

`pmu` 设备驱动出现于 NetBSD 4.0，然后是 FreeBSD 8.0。

## 作者

`pmu` 驱动由 Michael Lorenz <macallan@NetBSD.org> 编写，由 Nathan Whitehorn <nwhitehorn@FreeBSD.org> 移植到 FreeBSD。


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://book.bsdcn.org/man/man4/pmu.4.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.