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My Del Dimension E521 running Windows 7 puts itself in sleep mode each night -- despite the fact that I have chosen a power option that specifies NEVER

Each morning I find the monitor blank and I have to hit the power button on the PC at which point Windows "resumes". The system event log shows this:

Source:        Microsoft-Windows-Kernel-Power
Date:          3/27/2010 3:21:10 AM
Description:
The system is entering sleep.

Sleep Reason: System Idle

My specific power options are:

Turn off Display          : 20 Minutes
Put the computer to sleep : Never

Is there some other setting coming into play here?

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I am having issues with this as well on my Acer netbook. I have a feeling these settings are not as robust as they should be. I have changed mine to never while wired and it won't sleep on battery. Very annoying. I wouldn't be surprised if this is correct with an update eventually. –  Zooks64 Mar 27 '10 at 18:06
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4 Answers

up vote 8 down vote accepted

A lot of times Dell and other companies ship software bundled with the windows install. My Asus laptop had its own power management system that played havoc with my system for days. I would check to make sure there isn't a Dell program playing games.

Also on another note have you checked the 'Advanced Settings' in the power management. There is a other options in there for sleep/hibernate what not.

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That was it. I hadn't noticed the advanced settings. There I found a setting to hibernate after 1080 minutes (18 hours). Thanks for the info! –  Decker Mar 27 '10 at 22:22
1  
Huray. thank you. That's it. 1080min = 18 hours. Wonderfull. start-> control panel -> power options -> (choose power plan) Change plan settings -> Change advanced power settings -> expand Sleep -> Hybernate after... put 0 for never. –  user114205 Jan 18 '12 at 11:59
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Same power automatic shutdown problem here. Again goto advanced power management settings, look indeed for hybernate or sleep, change the 180 minutes into 0 for meaning NEVER.

Now I hope it works. The problem was here identical on Windows 8.

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I have got the same problem with my Lenovo T530 notebook with Windows 7 Professional 64 bit. The reason was the driver of the Microsoft Natural Keyboard 4000. The problem has been solved after switching off the checkbox "Allow this device to wake up the computer" at the "Power management" tab of the keyboard driver settings.

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Wow. This one was hard to find. Thank you very much for the information. It was exactly the same here with my T430, Win 7 64bit and a Cherry Keyboard. How did you find this out? –  pvorb Jul 15 '13 at 19:13
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I have a Lenovo Y500 laptop and was experiencing the same issue. After 10 minutes of inactivity, it would just go to sleep. This is despite the settings in Power Management and Advanced Settings. The culprit was Lenovo's Energy Management program (listed as simply "Energy Management" in the Control Panel.) I removed it via Add/Remove Programs and now my laptop is back to normal.

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