acpi_available command in Linux with examples

acpi_available is a command in Linux that tests whether the ACPI (Advanced Configuration and Power Interface) subsystem is available or not.

Syntax

$ acpi_available

Return Statuses of acpi_available

The command returns one of three possible statuses:

• Status 0: Indicates that the ACPI subsystem is available.
• Status 1: Indicates that the ACPI subsystem is not available.
• Status 2: Indicates a usage error has occurred.

Working with acpi_available

Here are some examples and detailed explanations of how to use the acpi_available command in practice.

Example 1: Checking the ACPI Availability

Here, echo $? is a command which is used to see the last return status.

Example 2: Simulating an Error

Here, we create a false error and then displayed return status.

Common Options for the acpi_available command

1. info acpi_available:

This option displays help information for the acpi_available command. It is useful when you’re unfamiliar with the command’s functionality or need clarification on its usage

Example:

Conclusion

The acpi_available command is a simple yet powerful tool to check whether the ACPI subsystem is available on your Linux system. ACPI is crucial for efficient power management, thermal control, and hardware component management, particularly on laptops and mobile devices. By understanding the return statuses and usage scenarios of acpi_available, you can quickly determine if your system supports ACPI and troubleshoot any related issues.