Windows 7 Goes to Sleep in conflict with Power Option Setting

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?

Solution 1:

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.

Solution 2:

I had the same problem on Windows 10 and it happened when I resumed the notebook from sleep by using USB wireless mouse. It seems that sometimes Windows doesn't know why it resumed from sleep and assumes it was a remote wakeup.

However Microsoft added new hidden settings in Windows 7 which control sleep timeout after remote wakeup and the default setting is only 2 minutes!

To fix this, you need to change registry values AcSettings and DcSettings for timeout when on AC power and when on battery power. Or you can simply delete these values. They are under

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0\DefaultPowerSchemeValues\@@@

where @@@ represents Power Scheme:

Balanced: 381b4222-f694-41f0-9685-ff5bb260df2e\

High Performance: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c\

Power Saver: a1841308-3541-4fab-bc81-f71556f20b4a\

Based on this technet thread.

Solution 3:

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.

Solution 4:

I had the same problem, but my settings were all set to Never (also in the Advanced Settings).

This means that under circumstances, Windows really ignores those settings!

My solution was to go to Advanced Settings and put a setting of 14400 Minutes there, which equals to 10 days.

This idle timeout is so long that it solves my problem.

(You can find the Advanced Settings here: Control Panel -> Power Options -> Choose Power Plan -> Change Plan Settings -> Change Advanced Power Settings -> Expand Sleep)

Solution 5:

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.