Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Power
management
function to be
performed
System entity
performing it
Platform
information
required
Object
providing
information
Comments
Choose a device
state that
supports Wake
Device Power
Policy Owner
List of
supported
states, filtered
by ability to
cause a wake
event
_PRW,
_SxW
Addition of the requirement for
additional power resources
listed in _PRW cause wakeincapable
states to be removed
from the list of supported states
(above)
SxW defines the mapping of
wake capable device states to
system states
Arm a device for
wake
OSPM
Control
mechanisms for
enabling wake
at the platform
level
_PRW,
Wake-capable
device interrupt,
_DSW
_PRW specifies the GPE bit to
enable for wake. On HWreduced
platforms, the wakecapable
attribute of a device
interrupt indicates which
interrupt to enable for wake
_DSW is optional, depending on
the needs of the platform wake
hardware
Enter a selected
device state
OSPM
Control
mechanisms for
power
resources
_ON, _OFF,
_PSx
_ON and _OFF control the
power resources
PSx controls other platform
hardware relevant to state
changes but not exposed to
OSPM as power
resources.*(See Note, below.)
Choose a
targeted system
sleep state
System Power
Policy Owner
List of
supported
system Sleep
states (S1-S4)
_Sx
S0 and S5 are assumed to be
supported in all cases
Enter a selected
system state
OSPM
Control
mechanisms for
system states
_PTS, _TTS
and _WAK
If _S5 exists, ACPI uses the
SLP_TYP/SLP_EN bit fields in
the PM1 Control Register (or the
SLEEP_CONTROL/
SLEEP_STATUS registers
specified in the FADT)
If _S5 is not specified,
alternative methods are used to
turn-off the system.
390 April, 2015 Version 6.0