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Support for Multiple Power Policies

Mobile platforms with Intel AMT support configuration of the maximum Power State where Intel AMT will operate. The configuration options support detection of AC (power cord) operation and DC (battery) operation. Intel AMT can be configured to operate in Sx states with AC but not with DC only. Power states are tied to power packages. The packages available on a particular platform running earlier versions of Intel AMT are OEM specific and may vary from one implementation to the next, but certain packages are required on all Intel® vProTM mobile platforms, as indicated in the table below. The Intel AMT firmware returns the descriptive strings when it is requested to enumerate the available power packages or to return the current active power package. “On in S0” indicates that the Intel® Management Engine (ME) and Intel AMT firmware are active when the host processor is active, even when the platform is on DC (battery) power. This is true for all packages when the platform is in S0. “ON in S0, S3/AC” indicates that the ME and Intel AMT are active when the host processor is in a sleep state (S3), as long as the platform is attached to AC power. Similarly, “ON in S0, S3/AC, S4-5/AC” says that the ME and Intel AMT are active even when the host is powered down, as long as there is AC power to the platform. The “WoL” (Wake on LAN) options indicate that when the host is asleep or off (depending on the package), the ME will “wake up” when the network interface detects an ARP or ICMP packet or a manageability message (a message addressed to one of the Intel AMT IANA ports). The ME will transition to a lower power state after a period of no activity. This period of time is configurable, but should be set to no less than three minutes in Linux environments. The default, and minimum, setting is two minutes. Release 2.5/2.6 Wake on LAN applies only to a wired interface.

With Release 4.0, the ME will “wake up” if management traffic arrives on the wireless LAN. The release supports wireless out-of-band management traffic in Sx states with AC but not with DC.

Note that there are separate capability settings for the ME power package and for the network interfaces. The power package setting takes precedence over the network interface setting: Even if a network interface is set to “wake up” the ME when it receives traffic in an Sx state, if the selected power package  is set to be ON only in S0, then traffic in an Sx state will not “wake up” the ME.

Since Release 6.0, Intel AMT supports two specific packages, as noted in the following table. There are no optional packages.

Intel AMT Release 2.5/2.6/4.x/6.x/7.0/8.0 Mobile Power Packages

Required/Optional

Descriptive String

Required

Mobile: ON in S0

Required in 6.x/7.0/8.0
(Optional in 2.5/2.6/4.x)

Mobile: ON in S0; ME WoL in S3/AC, S4-5/AC

Required in 2.5/2.6/4.x
(Not available in 6.0 and later releases)

Mobile: ON in S0, S3/AC

Required in 2.5/2.6/4.x
(Not available in 6.0 and later releases)

Mobile: ON in S0, S3/AC, S4-5/AC

Optional in 2.5/2.6/4.x
(Not available in 6.0 and later releases)

Mobile: ON in S0; ME WoL in S3/AC

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