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I have my computer set to "Suspend when inactive for 30 minutes" in system settings. This function works fine if a user is logged in and does not do anything for 30 minutes. However, if all users are logged out and the computer is at the LightDM login screen, the computer will never go to sleep. How do I get the computer to sleep even if no users are logged in?

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Similar unanswered question – Amit Naidu May 10 '13 at 10:05

You might want to take a look at this. The second comment provides a good answer.

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