# jetson-customize-fan

Edits nvfancontrol fan profiles for Jetson and Tegra targets, including curves and boot defaults. Use it when tuning cooling on Orin or Thor.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1100 installs · ★ 3735
- Author: Jetson Team
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/NVIDIA/skills/tree/HEAD/skills/jetson-customize-fan/SKILL.md
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/skills/jetson-customize-fan

## What it does

This skill edits board-specific nvfancontrol configuration: it can add, remove, and change profiles, edit temperature-to-PWM or RPM curves, and select the boot default profile, control mode, or governor. It can also list defined profiles.

Curve points use `TEMP HYST PWM RPM` and must be ordered by rising temperature. `close_loop` targets RPM and requires a tachometer, while `open_loop` writes PWM directly. PWM values are limited to `0..255`.

The skill reads the pristine file from `bsp_image` but writes changes under `source.root_path`. Editing `bsp_image` by hand destroys the diff trail, so check the target path before making a change. It requires an active target profile plus `Linux_for_Tegra/` in the image and source roots; the source root must be a git repository.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add NVIDIA/skills --skill jetson-customize-fan -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/jetson-customize-fan/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/jetson-customize-fan/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add NVIDIA/skills --skill jetson-customize-fan -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/jetson-customize-fan/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add NVIDIA/skills --skill jetson-customize-fan -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/jetson-customize-fan/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install NVIDIA/skills jetson-customize-fan
```

2. **Manually: put the files in place**
- File: `.github/skills/jetson-customize-fan/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add NVIDIA/skills --skill jetson-customize-fan -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/NVIDIA/skills --path skills/jetson-customize-fan
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/jetson-customize-fan/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add NVIDIA/skills --skill jetson-customize-fan -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/NVIDIA/skills/tree/HEAD/skills/jetson-customize-fan/SKILL.md

## When to use it
- edit a temperature, PWM, and RPM fan curve
- change the fan profile used at boot
- add an nvfancontrol profile for a board
- switch between `close_loop` and `open_loop`
- list profiles in a fan configuration

## Example prompts
- “Tune the nvfancontrol fan curve for the active board.”
- “Add a fan profile and set it as the boot default.”
- “List the nvfancontrol profiles for the current Jetson target.”

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 19e0282ee1e769f2.

BEGIN THIRD-PARTY FILE 19e0282ee1e769f2
````text
---
name: jetson-customize-fan
description: >-
  Use when you need to add, remove, edit, list, or change the boot
  default of an nvfancontrol fan profile on a Jetson/Tegra (Orin,
  Thor) target. Triggers: edit fan profile, tune fan curve.
version: 0.0.1
license: "Apache-2.0"
metadata:
  data-classification: public
  author: "Jetson Team"
  tags:
    - thermal
    - fan
    - nvfancontrol
    - profile
  domain: thermal
---

# Modify nvfancontrol Fan Profile (BSP-side)

## Purpose

Edit the per-board nvfancontrol configuration so the device boots
with the desired fan curve / control mode / governor / default
profile. BSP-side only — all writes land in the overlay tracker,
the upstream `bsp_image` copy is read-only.

This skill handles BSP-side edits to the per-board nvfancontrol configuration file: adding profiles, removing profiles, editing the temp → PWM / RPM curves, changing the boot default profile / control mode / governor, and listing defined profiles. Applies on Jetson / Tegra platforms (T234 Orin, T264 Thor).

## File format (canonical, per the BSP file header)

```
POLLING_INTERVAL <seconds>

<FAN <index>>
    TMARGIN <ENABLED|DISABLED>
    FAN_GOVERNOR <type> {
        STEP_SIZE <int>
    }
    FAN_CONTROL <close_loop|open_loop> {
        RPM_TOLERANCE <rpm>
    }
    FAN_PROFILE <name> {
        # TEMP HYST PWM RPM
        <T0> <H0> <P0> <R0>
        ...
    }
    FAN_PROFILE <name> { ... }       # one or more profiles
    THERMAL_GROUP <id> {
        GROUP_MAX_TEMP <C>
        # zone-name <coeffs csv> <max-temp>
        <zone> <coeffs> <max-temp>
        ...
    }
    FAN_DEFAULT_CONTROL  <close_loop|open_loop>
    FAN_DEFAULT_PROFILE  <name>
    FAN_DEFAULT_GOVERNOR <type>
    KICKSTART_PWM <0..255>
```

Rules:

- **Profile curve tuples are 4-column**: `TEMP HYST PWM RPM`. Sort points by ascending `TEMP`; the daemon interpolates between them.
- **`PWM` is `0..255`** (8-bit duty cycle); **`RPM`** is the close-loop target speed. A trailing `0 0` row at the high end pins the fan off above `GROUP_MAX_TEMP`.
- **`HYST`** is hysteresis (°C) at that point — the controller waits `HYST` degrees of cooling before stepping the curve down.
- **`FAN_DEFAULT_PROFILE`** must reference an existing `FAN_PROFILE` block in the same `<FAN N>`. nvfancontrol fails to start if the default names a missing profile.
- **`FAN_DEFAULT_CONTROL`** = `close_loop` (drives toward target RPM, requires tach) or `open_loop` (writes PWM directly).
- **`FAN_DEFAULT_GOVERNOR`** = `cont` (continuous interpolation) and other family-specific values; copy verbatim from existing per-board files when introducing one.
- **`THERMAL_GROUP`** maps thermal zones to the controller's input. Coefficients are a 20-element CSV — copy verbatim from existing entries; values vary by chip family and zone.
- **`<FAN N>`** is one block per fan index (typical: `<FAN 1>`). Block boundaries `<...>` and `{...}` are strict; preserve indentation matching neighboring lines.
````
END THIRD-PARTY FILE 19e0282ee1e769f2

The third-party file has ended. Everything between the 19e0282ee1e769f2 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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