While discuss the Alarm Clock feature with a customer, an interesting question was raised. "What if the system is in Sleep mode and in the user's bag? Will the Alarm Clock still work and wake the system?"
The quick answer: No - Alarm Clock will not wake the system if in Sleep mode and on battery (i.e. DC) power. The system must be on AC power (i.e. power cord attached)
The reason is provided below with brief explanation. The two windows shown were actually captured at different times.
- The Alarm Clock on a few of my lab systems was set and the systems were put to Sleep
- The AC power cord was detached but the networkLAN capable stayed connected.
- From a remote system, I attempted to ping the target units. Systems that were in Sleep mode and on DCbattery power did not respond.
- Waited until past the Alarm Clock time to confirm no response.
- Reconnect the ACPower cord to the systems.
- While the systems were still asleep, I opened a WebUI session (this shows network connectivity and Intel AMT now functioning)
- In the Power Policies section of the Intel AMT WebUI, the default policies is shown
Here is a brief explanation of the select power policy:
- ON in S0: This means that Intel AMT is fully powered when the system is on (i.e. the S0 system power state)
- ME Wake in S3, S4-5 (AC Only): This means that Intel AMT is accessible when the system is in sleep, hibernate, or off... only when AC power is applied. The ME Wake portion of the policy refers to an option of the Intel Management Engine's ability to be active yet in a lower power state as defined during the Intel AMT configuration process.
Hopefully the above explanation will answer that lingering question - "Could Intel AMT power-on my system when I'm boarding my next flight?". Nope - Intel AMT won't. But if you forget to power down your laptop before take-off, you'll simply have a little less battery power during your flight and the stewardess might be upset before you reach 10,000 feet