Advanced Configuration and Power Interface Specification

Power and Performance Management
Arguments:
None
Return Value:
None
7.3.5 _PS3 (Power State 3)
This control method is used to put the specific device into its D3 state. This control method can only
access Operation Regions that are either always available while in the system working state (S0) or
that are available when the Power Resources referenced by the _PR0, _PR1 and PR2 objects are all
ON.
Arguments:
None
Return Value:
None
7.3.6 _PSC (Power State Current)
This control method evaluates to the current device state. This control method is not required if the
device state can be inferred by the Power Resource settings. This would be the case when the device
does not require a _PS0, _PS1, _PS2, or _PS3 control method.
Arguments:
None
Return Value:
An Integer that contains a code for the current device state
The device state codes are shown in Table 7-228.
Table 7-228 PSC Device State Codes
Return Value
Device State
0 D0
1 D1
2 D2
3 D3
7.3.7 _PSE (Power State for Enumeration)
This control method is used to put a device into a powered mode appropriate for enumeration by its
parent bus. This control method can only access Operation Regions that are either always available
while in a system working state or that are available when the Power Resources referenced by the
_PRE object are all ON.
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