Since I upgraded to iTunes 11, my iMac (27", 2011) goes to sleep during playback to my Apple TV. This didn't happen before the upgrade, so it has to be related to the upgrade. Does anyone what I could do to prevent this from happening? It's kind of annoying. Standard standby time for the iMac is 10 minutes. Thus, after 10 minutes of playback my iMac goes to sleep. Both, my iMac and my Apple TV are running the most up-to-date software.
IMac – Standby during playback since iTunes 11
appletvimacitunes
Related Solutions
I'm not sure how this was resolved, but the latest version of iTunes now works fine.
Have you tried Change Keyboard Type in System Preferences -> Keyboard?
Related Question
- How to prevent the iMac from sleeping while media is being played or streamed
- Apple TV stops playing the video from movies at 10 minutes
- Netflix app on AppleTV crashes and restarts after beginning to play
- IMac – Target Display Mode troubles, can’t disconnect anymore
- iMac Crashing – Fix iMac 14,2 Crashing After 10.14.2 Upgrade
- iMac Display – Fix Random Sleep During Use and Check Event Logs
Best Answer
I think the only way to prevent this from happening right now is to increase your standby time.
The reason it goes to sleep is that iTunes 11 does not set a "power assertion". Here's an Open Radar bug report on this issue: http://openradar.appspot.com/12791690.
Hopefully Apple will change this in an update because I'm having the same annoying problem.
Update 2012-12-13: iTunes 11.0.1 just came out and the missing power assertion has returned. Your computer should no longer sleep when streaming to the AppleTV.