---
name: "acpihelp"
section: "1"
platform: "linux"
package: "acpica-tools"
version: "20250404-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/acpihelp"
---

# acpihelp(1)

ACPI help utility

## NAME

acpihelp - ACPI help utility

## SYNOPSIS

**acpihelp** \<option\>*...* \[\<name-prefix\>\|\<hex-value\>\]

## DESCRIPTION

This manual page briefly documents the **acpihelp** command. The option list is taken from the acpihelp interactive help.

**acpihelp** provides descriptive text for AML and ASL keywords, methods, and opcodes.

Much more detailed documentation may be found at http://www.acpica.org/documentation/.

If neither a \<name-prefix\> or a \<hex-value\> is provided, **acpihelp** will do the logical equivalent of a "display all."

A default search (that is, a search with no options) and a \<name-prefix\> can mean two different things: (1) if \<name-prefix\> does not start with an underscore, find ASL operator names, or (2) if \<name-prefix\> does start with an underscore, find ASL predefined method names.

## OPTIONS

### ACPI Names and Symbols

- **-k \[\<name-prefix\>\]**

  Find/Display ASL non-operator keyword(s)

- **-m \[\<name-prefix\>\]**

  Find/Display AML opcode name(s)

- **-p \[\<name-prefix\>\]**

  Find/Display ASL predefined method name(s)

- **-s \[\<name-prefix\>\]**

  Find/Display ASL operator name(s)

### ACPI Values

- **-e \[\<hex-value\>\]**

  Decode ACPICA exception code

- **-i**

  Display known ACPI Device IDs (\_HID)

- **-i \[\<hex-value\>\]**

  Decode hex AML opcode

## AUTHOR

acpihelp was written by Robert Moore \<robert.moore@intel.com\>.

This manual page was written by Al Stone \<ahs3@redhat.com\> for the Fedora project (but may be used by others).