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What counts as "activity" for the purposes of sleep modes?

Special K

Diamond Member
I have an EVGA X58 SLI motherboard and am having an issue with sleep mode. I have S3 sleep enabled in my BIOS and in Windows Vista x64. Normally my PC will go to sleep after the inactivity time specified in Windows, and will wake up without issue.

Recently it stopped doing this. I can still manually put it to sleep from the start menu, and it will still wake up without issue, but it will never go to sleep on its own, even if I set the idle time to 1 minute.

After some experimenting, I discovered that it works properly again after I restart the computer. It became clear to me that something I was doing after starting or restarting my computer was causing the computer to no longer enter sleep mode automatically after being idle.

After some more experimenting, I think the culprit is Left 4 Dead. I mainly use my PC for gaming, and the only game I have been playing since I noticed this problem is L4D.

Here is my question: obviously the computer is not going to sleep on its own because it doesn't think it is "idle". What activities would cause the computer to not be idle? If I've already quit the game and am not moving the mouse or keyboard, what else could be going on in the background that would make the computer not be in the idle state? I do have AV software installed, but that has been present ever since I built this computer, and the idle sleep mode worked fine for a long time after I built this computer.

What could be causing the computer to think it's not idle?
 
Look at Resource Monitor (Vista/W7) or Performance Monitor (XP), and see what the CPU is doing.

Or even better, download Process Explorer from Microsoft (free!).
 
Originally posted by: Billb2
Look at Resource Monitor (Vista/W7) or Performance Monitor (XP), and see what the CPU is doing.

Or even better, download Process Explorer from Microsoft (free!).

OK, but what exactly should I be looking for? The CPU doesn't have to be at 0% for the computer to enter sleep mode.
 
One thing I've found is to disable all media sharing in WMP options (buried). This prevented a few of my machines from entering sleep. Disabling this took care of it. Not sure about l4d though.
 
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