Advanced Configuration and Power Interface Specification

ACPI Overview
Low Power
S0 Idle
Capable
Hardwarereduced
ACPI
OSPM Behavior
0 1 Fixed-feature hardware interface not
accessed.
Sleep/Resume Power Management
using FADT SLEEP_*_REG fields
and Interrupt-based wake signaling.
1 0 Fixed hardware interface accessed
for features and events.
Platform-specific Low-power Idle
power management.
1 1 Fixed-feature hardware interface not
accessed.
Platform-specific Low-power Idle
power management.
Platform Implementation
Implement GPIO-signaled ACPI Events;
Implement software alternatives to any
ACPI fixed features, including the Sleep
registers.
Implement wake-capable interrupts for
wake events.
Implement Fixed-feature hardware
interface.
Implement low-power hardware such
that the platform achieves power savings
in S0 similar to or better than those
typically achieved in S3.
Implement GPIO-signaled ACPI Events;
Implement software alternatives to any
ACPI fixed features desired;
Implement wake-capable interrupts for
any wake events.
Implement low-power hardware such
that the platform achieves power savings
in S0 similar to or better than those
typically achieved in S3.
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