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I have two Macbook Pros running on Yosemite. The first one is a 17 incher from 4 years ago. I'm able to set the time that it sleeps. The second one is a 15 incher retina made this year. In its energy saver section, I don't see a way to set the sleep time. It only shows the display time. How do I make both slider controls show up on this new Macbook Pro?

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  • I can't add a comment because I don't have sufficient reputation, so instead I'm forced to comment by adding an answer. When I discovered the "computer sleep" slider was missing, and then read the above description of why Apple deliberately chose to do this, I exasperatedly exclaimed "But now I have no control over how much time elapses before I am forced to enter a password to resume using the computer!". Well, it turns out Apple exposes that functionality in another section of the Settings app: Security & Privacy -> General -> Require password x minutes after sleep. [![enter image descriptio – Jason Pepas May 27 '16 at 1:07
  • I just checked Apple's page, supposedly updated for Sierra, and it still talks about having a separate slider for the computer. – Andrew Wolfe Nov 3 '16 at 12:10
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Deliberately Removed

Apple have removed the Computer slider from the Energy Saver settings. This is deliberate.

The decision is related to Apple's introduction of improved hardware, Power Nap support, and the engineers' belief that OS X is best placed to manage the computer's power state.

If you would like to see this slider return, provide feedback to Apple.

Downloads and Other Long Running Tasks

OS X will stay awake during most long running tasks.

The behaviour will depend on the software downloading the file. Safari and Transmission, for example, both ask OS X to stay awake while a download is ongoing.

Applications need to lodge power assertions with OS X that explicitly stop the computer sleeping. You can see these assertions using the following pmset command:

pmset -g assertions

For older software, you can add this behaviour using the built-in command line tool caffeinate.

Third Party Alternatives

Third party tools exist to supplement the Energy Saver settings. I created Power Manager and it can put your Mac to sleep after inactivity.

Other tools exist and you could probably create a script to also recreate this behaviour.

  • Apparently it is a Haswell "feature" forums.macrumors.com/showpost.php?p=17457370&postcount=11 – n1000 May 25 '15 at 18:25
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    @n1000 I didn't understand all that tech jargon in that article. Does that mean when my display sleeps, my computer also sleeps? What if I was downloading a huge file that would take 5 hours to complete? How would I make the display sleep after 15 minutes of activity, but still have the computer on so that the download is not cut off? – JoJo May 25 '15 at 23:59
  • So, does the 'Prevent computer from sleeping automatically when the display is off' actually do anything? Or is it equivalent to setting 'Computer Sleep' to 'never' on the old interface? – Peter Aug 11 '18 at 2:39
  • @Peter please could you ask a new question. This is the best way to attract answers. Comments are not widely seen. – Graham Miln Aug 11 '18 at 7:25
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Basically, Safari will download the file but it will not go to sleep.

You can also check the box that says "Prevent computer from sleeping automatically when the display is off." I have that box unchecked; power nap really, in this case, does help. I've actually ended up answering one of my own questions by reading this thread.

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