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Installing a VMware Workstation 7.1 Windows 7 VM, and find that I cannot enable hibernation with powercfg --h on. Windows says 

An internal system component has disabled hibernation

What's wrong and how to fix it?

enter image description here

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2 Answers

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Use the registry to enable hibernation back.

  1. start regedit.exe
  2. go to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentCongtrolSet\Control\Power
  3. change the value HibernateEnabled from 0 to 1.

Now reboot and look if you have hibernation back.

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Checked that key, no luck, HibernateEnabled is already set to 1. – Jimm Chen Dec 20 '12 at 7:32
ok, in this case set it 0 and reboot and now try to run the powercfg command. – magicandre1981 Dec 20 '12 at 12:05
up vote 0 down vote accepted

I finally got it. Windows 7 and 8 does not allow hibernation if it is installed inside a VHD.

Windows 7 powercfg.exe does not make it explicit. Windows 8 does, a screen shot below:

enter image description here

I cannot figure out the reason why Microsoft impose such limitation. If he puts hiberfil.sys onto a partition from a real disk , things should be able to go smooth.

BUT, is there a way to know it on Windows 7, through a system log or something?

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