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I scheduled a task in Windows 7 to play music at a particular time of the day. The scheduler allows a setting that makes the laptop power up from Sleep/Hibernation mode automagically. I guess that would be some setting that windows does on the BIOS.

Now there is a setting that allows me to specify that even if the PC is on battery power run the task. Also in my power settings I have enabled Allow Wakeup Events when running on battery.

But somehow the PC is not powered on automagically when the AC power is not connected. It does resume from hibernation when on charging. The battery is new so that should not be a problem.

Why is the PC not able to resume itself from hibernation when not connected to a power source?

Nick Josevski
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Rohit Banga
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3 Answers3

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Waking from hibernation in Windows 7 apparently does not work too well when on battery.

Have a look at the freeware WakeupOnStandBy, which supposedly answers your needs, and might work better than the Windows scheduler.

If your computer has any power-configuration problems that impact on sleep/hibernate, Windows 7 has a utility to analyze such problems. See the article below on how to use the utility, and add the problems it finds to your post (or even better just upload the entire report somewhere and add the link to your post):
Evaluate System Energy Usage and Get Power Management Report with PowerCfg -Energy Switch in Windows 7.

harrymc
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I'm guessing it may be doing sleep as opposed to standby, so:

Make sure hibernation is the only thing on. Go into the advanced power options and make sure "Turn off hard disk" is set to 0 (never), make sure under "sleep" the only things on are "hibernate after" and "Allow wake timers". After all that, it should be fine.

The difference between sleep, hibernate, and hybrid-sleep is where it stores the files and power consumption. Sleep stores your current working memory in the memory and still consumes power. Hibernate stores your current working memory on the hard drive and shuts off your power completely. Hybrid sleep does a little bit of both, storing it on both the memory AND hard drive, but keeping the computer on.

Alternatively, a laptop won't start if it has less than a certain amount of battery (which you can also set in power options). If it's less than a certain threshold, maybe it won't start regardless?

Duall
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Somebody from infocentre.pl let me know that this problem occurs because of Windows Media Center, and this file can fix the problem:

http://download.microsoft.com/download/7/F/E/7FE105A7-B261-4737-8F09-2304D8705E6B/MicrosoftFixit50448.msi

It worked for me.

Excellll
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Politechnik
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