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I have my Energy Saver->Battery->'Turn display off after:" set to 2 minutes. This setting is exactly how I want power settings to behave when I'm using the computer on my lap. However, when I hook up to Apple TV for a presentation it still shuts off after 2 minutes which disconnects apple TV and disrupts the presentation.

Is there a way to have a different Energy Saver setting when using Apple TV (or other external monitor)? I frequently switch between using Apple TV and not to the point that changing Energy Saver every time is a burden.

Using a 2015 Macbook Pro on El Capitan.

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You can keep your Mac on forever when you need to (including while AirPlaying) without digging into settings if you download the Mac app Amphetamine. With Amphetamine, a button will appear on your Mac's menu bar. Just click it to prevent your Mac from sleeping indefinitely, and click it again to allow it to sleep. This is a very simple method of keeping your Mac on forever, especially useful while downloading a large file or—like you're doing—AirPlaying.

Alternatively, you can use macOS's built-in command line tool caffeinate to keep your Mac awake for longer periods.

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Try something like this: https://itunes.apple.com/us/app/amphetamine/id937984704?mt=12

With just a click you can keep the display on for a set or indefinite amount of time.

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