Set up automatic suspend
You can configure your computer to automatically suspend when idle. Different intervals can be specified for running on battery or plugged in.
- Go to the desktop and start typing Power. 
- Click Power to open the panel. 
- In the Power Saving Options section, click Automatic Suspend. 
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Choose On Battery Power or Plugged In, set the switch to on, and select a Delay. Both options can be configured. On a desktop computer, there is one option labeled When Idle.