Intel AMT Features > Remote Control > Detailed Description > Intel AMT Power State Transitions

Intel AMT Power State Transitions

The following tables show if the described power transition is supported for each possible host power state. They represent the capabilities starting in Release 5.0.

In releases earlier than 5.0, power down cannot be done from S3 (power cycle and power on are supported).

 Note:

On a platform that supports Connected Standby or Modern Standby, Intel AMT remote control commands do not support transitioning the platform to Sleep state (S3), Connected Standby or Modern Standby.

   HOST RESET (host reset without power cycle)

Host Sx State

ME Support

Comments

S0

SUPPORTED

 

S1

SUPPORTED

 

S3

NOT SUPPORTED

Intel AMT returns an “invalid command” error.

S4

NOT SUPPORTED

Intel AMT returns an “invalid command” error.

S5

NOT SUPPORTED

Intel AMT returns an “invalid command” error.

 

   POWER CYCLE RESET (host reset with power cycle)

Host Sx State

ME Support

S0

SUPPORTED

S1

SUPPORTED

S3

SUPPORTED

S4

NOT SUPPORTED

S5

NOT SUPPORTED

 

 Note:

If there is an active redirection session (SOL, Storage Redirection, or KVM), Intel AMT rejects a POWER CYCLE RESET or power off request as invalid.

 

   UNCONDITIONAL POWER DOWN (POWER OFF)

Unconditional Power Down forces the system into an S5 entered by override or a Legacy OFF powered off state. This power-down occurs without any blocking from software or the system. Because of this, ACPI and system state context is not guaranteed to be preserved.

Host Sx State

ME Support

Comments

S0

SUPPORTED

 

S1

SUPPORTED

 

S3

SUPPORTED in Intel AMT Release 5.0 and later releases

The spec does not require the ACPI context to be “unpreserved”. Therefore S3 can be treated like an Unconditional Power Down command. Intel AMT returns success but does not execute the command

S4

NOT SUPPORTED

 

S5

NOT SUPPORTED

 

 

 Note:

If a redirection session (SOL, Storage Redirection, or KVM) is active, Intel AMT rejects a POWER OFF request because the session will close.

 

   POWER UP

The power-up function brings a sleeping system into the S0/G0 “working” state or into the Legacy ON state.

Host Sx State

ME Support

S0

SUPPORTED BUT IGNORED

S1

NOT SUPPORTED

S3

SUPPORTED

S4

SUPPORTED

S5

SUPPORTED

     

Beginning in Release 9.0, when LMS initializes, it will configure the FW to graceful shutdown support:  CIM_PowerManagementCapabilities.PowerChangeCapabilities.  This includes support for the following Intel AMT power state transitions.  After capabilities are configured by LMS, the values are preserved by the FW. 

Use CIM_AssociatedPowerManagementService.AvailableRequestedPowerStates to get the available transitions at a given point in time and not just the capabilities of the system.  The current available power state transitions are computed by the FW and based on the system’s general capabilities and the current power state.  See Change System Power State for more details.

Beginning in Release 10.0 with Windows 8 connected standby, also known as Instant Go, whereby LMS is not available, Intel AMT is able to continue to support remote control operations.  Using Intel AMT’s ability to generate a power button press operation, LMS is able to wake the host from connected standby to execute the remote control operations supported from Release 9.0.

Note: To enable Intel AMT to power on a platform that is in the connected standby state, the Intel HID (Human Interface Device) Event Filter driver must first be installed on the platform, and the platform’s BIOS must implement Intel Proprietary Wake.

   SLEEP-DEEP

Host Sx State

ME Support

S0

SUPPORTED

S1

NOT SUPPORTED

S3

NOT SUPPORTED

S4

NOT SUPPORTED

S5

NOT SUPPORTED

 

   Hibernate (Off-Soft)

Host Sx State

ME Support

S0

SUPPORTED

S1

NOT SUPPORTED

S3

NOT SUPPORTED

S4

NOT SUPPORTED

S5

NOT SUPPORTED

 

   Off (Soft Graceful)

Host Sx State

ME Support

S0

SUPPORTED

S1

NOT SUPPORTED

S3

NOT SUPPORTED

S4

NOT SUPPORTED

S5

NOT SUPPORTED

 

   MASTER BUS RESET GRACEFUL

Host Sx State

ME Support

S0

SUPPORTED

S1

NOT SUPPORTED

S3

NOT SUPPORTED

S4

NOT SUPPORTED

S5

NOT SUPPORTED

 

 

See Also:

   Sleep States

 

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