What is ACPI in Linux?

ACPI, known as a Hardware Abstraction Layer (HAL) in embedded computing, is an abstraction layer between the operating system, platform firmware and hardware. This allows the OS and the platform to evolve independently. ACPICA includes an ACPI Machine Language (AML) interpreter that is resident in the Linux kernel.

What is S0ix?

S0ix-states. represent the residency in the Intel® SoC idle standby power states. The S0ix states shut off part of the SoC when they are not in use. The S0ix states are triggered when specific conditions within the SoC have been achieved, for example: certain components are in low power states.

Should I turn ACPI off?

If you’re on a desktop then there isn’t an inherent danger to keeping ACPI off. Some components such as your SSD or CPU may have their lifetimes impacted, but not by noticeable amounts. Again, the biggest issues on a desktop are power consumption. I recommend testing out disabling ACPI .

What is Package C State?

Package C State Limit: Specifies the lowest C-state for the processor package. This feature does not limit the processors to enter any of the core C-states. This default setting is “No Limit”, all C-States supported by the processor are available.

Should I disable ACPI Linux?

Will ACPI and UEFI work on ARM servers?

As part of the work to prepare for Arm servers, the Linaro Enterprise Group has spent the last year getting ACPI and UEFI working on Arm. We’ve been working closely with Arm and Arm’s partners on this to make sure the firmware architecture meets the needs of the server market.

How do I disable ACPI in Linux kernel?

Processing of ACPI tables may be disabled by passing acpi=off on the kernel command line; this is the default behavior. In order for the kernel to load and use ACPI tables, the UEFI implementation MUST set the ACPI_20_TABLE_GUID to point to the RSDP table (the table with the ACPI signature “RSD PTR “).

How to pass ACPI tables to the ARMv8 kernel?

The only defined method for passing ACPI tables to the kernel on ARMv8 is via the UEFI system configuration table. Just so it is explicit, this means that ACPI is only supported on platforms that boot via UEFI. When an ARMv8 system boots, it can either have DT information, ACPI tables, or in some very unusual cases, both.

What is the acpi_20_table_GUID used for?

In order for the kernel to load and use ACPI tables, the UEFI implementation MUST set the ACPI_20_TABLE_GUID to point to the RSDP table (the table with the ACPI signature “RSD PTR “).