---
name: "radeontool"
section: "8"
platform: "linux"
package: "radeontool"
version: "1.6.3-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/radeontool"
---

# radeontool(8)

utility to get/set registers and to control backlight on radeon based laptops

## NAME

radeontool — utility to get/set registers and to control backlight on radeon based laptops

## SYNOPSIS

**radeontool** \[*option\]  \[command\]*

## DESCRIPTION

*This manual page documents briefly the*  **radeontool** command.

This manual page was written for the **Debian** distribution  because the original program does not have a manual page.

**radeontool** is a program that switches on/off  backlight and external output on ATI Radeon based laptops, and  is able to list or set register values.

## COMMANDS

You can specify one of the following commands:

- **dac \[on\|off\]**

  Power down the external video output

- **light \[on\|off\]**

  Power down the backlight

- **stretch \[on\|off\|vert\|horiz\|auto\|manual\]**

  Adjusts stretching for resolution mismatch

- **regs**

  Show a listing of some random registers

- **regmatch \[pattern\]**

  Show registers matching wildcard pattern

- **regset \[pattern\] \[value\]**

  Set registers matching wildcard pattern

## OPTIONS

These programs follow the usual GNU command line syntax,  with long options starting with two dashes (\`-').  A summary of  options is included below.

- **--debug**

  Show a little debug info

- **--skip=n**

  Skips the first n cards and acts on the n+1

## AUTHOR

This manual page was written by Luigi Gangitano luigi@debian.org for  the **Debian** system (but may be used by others).  Permission is  granted to copy, distribute and/or modify this document under  the terms of the GNU General Public License, Version 2 any   later version published by the Free Software Foundation.

On Debian systems, the complete text of the GNU General Public  License can be found in /usr/share/common-licenses/GPL.