A power package defines the power states at which the Intel ME operates and whether Wake on LAN is enabled or not. Each power package has a well-known GUID and a descriptive string. The ME is off for S-states not listed in the descriptive string for each power package in the List of Power Packages table. An OEM can selectively delete those power packages that are noted in the table as optional.
“WoL” or “Wake” in the descriptive string indicates that when the host is in one of the indicated S states, the ME will enter a sleep state after a period of inactivity. Traffic addressed to the Intel AMT IP address (which may be host traffic if the IP address is shared with the host) will wake up the ME. The AMT_GeneralSettings.IdleWakeTimeOut parameter defines the length of the period of inactivity (no manageability traffic) during which the ME will remain awake.
The “AC” in the descriptive strings indicates that the Management Engine and Intel AMT are active only when the platform is connected to AC power. Intel AMT is never active in sleep or off states when the platform is running from a battery.
The last two packages for Release 3.0 contain “OFF After Power Loss” in their descriptive strings. The packages support Wake on LAN but the ME will not wake up after a power failure. This option reduces the likelihood of a surge after restoration of power when many machines attempt to power up simultaneously.
Release 6.0 and later releases support two required power packages each for desktop and mobile platforms. The corresponding GUIDs are the same as in previous releases.
The GUIDs are passed between applications and Intel AMT as a base-64 string. The table List of Power Packages shows the corresponding base-64 version of each GUID.
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