> 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/pchtherm.4.md).

# pchtherm.4

`pchtherm` — Intel PCH 热子系统

## 名称

`pchtherm`

## 概要

`device pci device pchtherm`

## 描述

`pchtherm` 驱动提供对 Intel PCH 芯片组中安装的传感器数据和配置的访问。`pchtherm` 配置寄存器。

通过 [sysctl(8)](/man/man8/sysctl.8.md) 接口访问 `pchtherm` 数据：

```sh
dev.pchtherm.0.ctt: 115.0C
dev.pchtherm.0.temperature: 28.5C
dev.pchtherm.0.t2temp: 91.0C
dev.pchtherm.0.t1temp: 86.0C
dev.pchtherm.0.t0temp: 81.0C
dev.pchtherm.0.tahv: 83.0C
dev.pchtherm.0.talv: 30.0C
dev.pchtherm.0.pmtime: 32
dev.pchtherm.0.pmtemp: 50.0C
dev.pchtherm.0.%parent: pci0
dev.pchtherm.0.%pnpinfo: vendor=0x8086 device=0x9d31 subvendor=0x17aa subdevice=0x2256 class=0x118000
dev.pchtherm.0.%location: slot=20 function=2 dbsf=pci0:0:20:2
dev.pchtherm.0.%driver: pchtherm
dev.pchtherm.0.%desc: Skylake PCH Thermal Subsystem
dev.pchtherm.%parent:
```

**`dev.pchtherm.%d.temperature`** 传感器读取的当前温度的只读值。

**`dev.pchtherm.%d.ctt`** 当系统达到此温度时将关机。当此功能被禁用并锁定时，此项不会出现。

**`dev.pchtherm.%d.t0temp`** 当温度低于此值时，系统将处于 T0 状态。

**`dev.pchtherm.%d.t1temp`** 当温度高于 `t0temp` 且低于此值时，系统将处于 T1 状态。

**`dev.pchtherm.%d.t2temp`** 当温度高于 `t1temp` 且低于此值时，系统将处于 T2 状态。高于此值时，系统将处于 T3 状态。

**`dev.pchtherm.%d.talv`** 低告警值。当传感器使能位被锁定且值为零（将显示 -50.0C）时，此项不会出现。

**`dev.pchtherm.%d.tahv`** 高告警值。当传感器使能位被锁定且值为零（将显示 -50.0C）时，此项不会出现。

**`dev.pchtherm.%d.pmtemp`** 传感器电源管理温度。低于此温度时，传感器将在 `pmtime` 秒内空闲。

**`dev.pchtherm.%d.pmtime`** 低温时传感器的空闲持续时间。

**`dev.pchtherm.%d.pch_hot_level`** 当温度高于此值时，PCHHOT# 引脚将被置位。当此功能被禁用并锁定时，此值不会出现。

更多详情请查阅 PCH 数据手册。

## 注意事项

所有值均为只读。当前不支持事件中断。

## 参见

[sysctl(8)](/man/man8/sysctl.8.md)

## 历史

`pchtherm` 驱动首次出现于 FreeBSD 13.0。

## 作者

`pchtherm` 驱动及本手册页由 Takanori Watanabe <takawata@FreeBSD.org> 编写。


---

# 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/pchtherm.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.