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)
Answer
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.
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