I'm testing SCCM 2012 in my lab right now. I have Windows 7 deployed to desktops and have configured Power Management settings on a collection as follows:

Peak hours
Start: 9AM  End: 6AM
Peak plan: Balanced without sleep enabled
Non-peak plan: Balanced
Wakeup time: 9:30AM

The plans are being applied properly, the desktops aren't sleeping until after the non-peak plan is applied at 6AM, so they start sleeping at about 7AM (default 1 hour sleep timer). However, they aren't waking up at 9:30. My first desktop woke up at 10:24AM and the other still hasn't woken up. I'm looking at pwrmgmt.log on the first machine and it I see this:

Date/Time 9/21/2012 10:24:08 AM The next wake up time is 2012-09-22 10:24:00.000.
....
Date/Time 9/21/2012 10:57:09 AM The next wake up time is 2012-09-22 09:35:00.000.

So immediately after the desktop wakes up it sets the next wakep time to 24 hours later, and then another ~30 minutes later it sets the wakeup time to what the collection setting is (well actually its still 5 minutes off). I will see again tomorrow what time it actually wakes up.

Can anyone tell me why I'm seeing this behavior?

• Edited by tpullins Friday, September 21, 2012 6:15 PM

While I don't know 100% and can't find it explicitly listed in the docs, this is probably a random delay to prevent all of your systems from waking up at the same time which could/would of course hammer your MP and/or DP as well as the actual power infrastructure. Most delays like this in ConfigMgr are up to two hours after the actual scheduled time and generally not configurable.

After looking closely at the logs it looks like the system is going back to sleep (or suspend) right after it wakes up. Here is a screenshot of the logs:

You can see at 6AM it applies the non-peak power plan and then goes to sleep an hour later at 7AM. When it wakes up at 9:57AM it goes back to sleep - Suspend (8) two minutes later. Is there a power plan setting that I'm overlooking?

I'm little bit confused about your power settings:

Is your Peak hours: 9 am to 6 PM (not AM)? And they go to sleep at 7 PM?

And you want to wake up the computers at 9:30 AM?

I've never tried to wake up computers during the peak hours, especially when you have disabled the sleep during the peak hours. Why do you want to wake up computers at 9:30 AM? Why don't you wake them up at e.g. 3 AM and when they would go back to sleep 1 hour after waking up (if everything is working ok)?

Panu

This is just a test lab. The peak is 9AM to 6AM. I'm doing it this way so that I can see what happens when I get in to the office in the morning. I can try to wake it up during the non-peak hours/plan but I don't see how this behavior would change.

Yes, I know this is an old post, but Im trying to clean them up. Did you solve this problem, if so what was the solution?