Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

So, I have a pretty new laptop, and one of its quirks is that, at random times (though typically in the middle of the night), it seems to wake up from sleep mode, churn a bit, and then go back into sleep mode. I write "seems" because its fans are very loud, so it's obvious when it's not asleep, but during the time it is "on", I can't see anything on the screen.

I have researched the problem somewhat, and could only find similar issues; nothing identical. In those cases, it appeared that certain devices could be responsible. Nothing is plugged into my computer during this behavior, but I nonetheless disabled every device's permission to wake the computer through the device manager. This included disabling the magic packet wake for the network (despite its only having a wireless connection). Using "powercfg /lastwake" gives an empty wake history. But, I also went through all the tasks and checked if they would wake the computer. None appeared to.

The problem persisted, so, after some more research, I found this, and executed it for all power schemes on the computer. The problem persists.

System:
OS: Windows 7 Professional
CPU: Intel 990X
GPU: NVIDIA GeForce 580M/12GB RAM
Motherboard: Clevo X7200
Model: NP7282-S1 (Sager-built laptop)

share|improve this question
1  
By tasks are you referring to scheduled tasks? Also, do you have "hibernate after x minutes" set? This will cause the laptop to wake up in order to initiate hibernate. –  Paul Apr 13 '12 at 2:05
1  
I would suggest to put your computer to hibernate instead of sleep mode, because in sleep mode it still consumes power. –  Niels Apr 13 '12 at 5:50
    
You can look in the event log, most tasks that are started in the task scheduler will appear in the event log. or It might be easier to just go straight to the task scheduler , and see all the fun things that are set to go off at night while your sleeping. The "screen standby" or monitor standby does not have to be changed to complete these tasks, as the screen off is an independant item. Some night stay up really late, sneak up behind it while it is doing its nocturnal routine, and check out the resource monitor :-) –  Psycogeek Apr 13 '12 at 5:55
    
Paul--I did on some of the power plans! I have removed them, so we'll see if that fixes it. Niels, true, but I can take the two or three percent battery hit for slow RAM refresh. The battery spontaneously leaking power is more of an issue for me. Psycogeek, I had checked the task scheduler; nothing was scheduled. Thanks all, –  imallett Apr 14 '12 at 2:40
    
Yup. That was it, Paul. Thanks so much! –  imallett May 16 '12 at 3:11

1 Answer 1

up vote 0 down vote accepted

The "hibernate after x minutes" setting in power settings will put the laptop into hibernate mode, however if this is longer than the setting for "sleep" mode it can cause the laptop to wake up in order to initiate hibernate.

Usually this is a very brief wake up, but the process of hibernation requires ram and other state information to be written to disk, which can take a while depending on RAM size.

Also, some drivers (through bugs) can interrupt this process and prevent the hibernate from completing, and the laptop then states in a woken state, consuming battery.

Try just using sleep or hibernate, rather than a combination.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.