![]() Don’t miss Apple’s article on the topic too for some additional help. This is a handy tip from Lifehacker who also provides a similar tip for Windows computers. When you’re happy with the information you’ve entered, click Save. To prevent your Mac from falling asleep, make sure you select Allow system to sleep when display is closed. Sometimes the same thing preventing a Mac from sleeping is responsible from waking it up too, like Time Machine and schedule backups. Next, select the Amphetamine behavior this criterion should trigger. ![]() On the other side of the fence, another command line tip shows us how to find out why a Mac woke up from sleep. ![]() If you’re having persistent problems with sleep and the above tip doesn’t give you any clue as to where to begin, sleep issues relating to hardware and power management quirks can often be fixed with an SMC reset. Why is that? Because iTunes is running and playing music, meaning the computer isn’t idle. You’ll notice the “sleep when idle” feature is disabled, but what you really want to pay attention to is the lower portion of the list where the “Listed by owning process” report shows as the reason that PreventUserIdleSystemSleep is enabled. Pid 1827: PreventUserIdleSystemSleep named: ".'AppleHDAEngineOutput:1B,0,1,1:0'.noidlesleep" Look through the reported assertion list for items with a “1” next to their name to find what’s keeping the Mac awakeįor example, if you see something like the following:.Launch Terminal from /Applications/Utilities/ and type the following command:.This works to determine both why a Mac won’t sleep and why a Mac display is not sleeping: It is set to sleep after 1 minute on battery.Determining the Cause of Sleep Prevention in Mac OS X with the Command Line I've quit every application and killed any non-system process I could see running under my user account. This is every process that is running on the machine at the moment. 627 Activity Monitor dtlokenĔ.1ĒĒ8.1 MB Intel (64 bit)Ħ29 activitymonitord rootĐ.5đđ.1 MB Intel (64 bit)Ħ44 AirPort Base Station Agent dtlokenĐ.0Ĕđ.8 MB Intel (64 bit)ġ25 rvice dtlokenĐ.0ēĘ.9 MB Intel (64 bit)Ĥ0 autofsd rootĐ.0Ēę36 KB Intel (64 bit)ģ9 blued rootĐ.0ēĔ.2 MB Intel (64 bit)ġ3 configd rootĐ.0ĕē.0 MB Intel (64 bit)ħ2 coreaudiod _coreaudiodĐ.0ĒĔ.1 MB Intel (64 bit)ĥ0 coreservicesd rootĐ.0ĔĒ1.1 MB Intel (64 bit)Ħ43 cupsd rootĐ.0ēĒ.1 MB Intel (64 bit)Ħ3 cvmsServ rootĐ.0đĘ40 KB Intel (64 bit)Ħ07 DashboardClient dtlokenė.0Ėē8.3 MB Intel (64 bit)ġ5 DirectoryService rootĐ.0ĕĕ.5 MB Intel (64 bit)ġ2 diskarbitrationd rootĐ.0Ēđ.4 MB Intel (64 bit)Ĥ3 distnoted daemonĐ.0ēđ.3 MB Intel (64 bit)Ĩ0 Dock dtlokenĐ.2ēĒ0.4 MB Intel (64 bit)ģ4 dynamic_pager rootĐ.0đė88 KB Intel (64 bit)Ĩ2 Finder dtlokenĐ.0Ėđ8.0 MB Intel (64 bit)Ģ89 Firewall dtlokenĐ.0đđ.3 MB Intel (64 bit)Ĩ8 fontd dtlokenĐ.5ēē.3 MB Intel (64 bit)ģ2 fseventsd rootĐ.0đ2Ē.2 MB Intel (64 bit)Ģ9 KernelEventAgent rootĐ.0ēđ,004 KB Intel (64 bit)ġ0 kextd rootĐ.0Ēđ4.0 MB Intel (64 bit)ġ launchd rootĐ.0ēđ.1 MB Intel (64 bit)ħ6 launchd dtlokenĐ.0Ēę56 KB Intel (64 bit)Ģ8 loginwindow dtlokenĐ.0ĒĘ.9 MB Intel (64 bit)Ģ7 mDNSResponder _mdnsresponderĐ.0ēĒ.4 MB Intel (64 bit)ġ31 mdworker dtlokenĐ.1ēđ6.8 MB Intel (64 bit)ġ1 notifyd rootĐ.0Ēė04 KB Intel (64 bit)Ĩ5 pboard dtlokenĐ.0đĘ32 KB Intel (64 bit)Ħ24 Quick Look Helper dtlokenĐ.0Ėē7.0 MB Intel (64 bit)ĥ31 rcd dtlokenĐ.0Ēĕ.6 MB Intel (64 bit)Ģ3 securityd rootĐ.0Ēē.0 MB Intel (64 bit)Ħ13 SyncServer dtlokenĐ.0ĕĕ.8 MB Intel (64 bit)ġ4 syslogd rootĐ.0ĔĘ12 KB Intel (64 bit)Ĩ1 SystemUIServer dtlokenĐ.3ēē0.9 MB Intel (64 bit)ĩ2 UserEventAgent dtlokenĐ.0ēĕ.1 MB Intel (64 bit)ĥ7 WindowServer _windowserverē.2Ĕĕ2.5 MB Intel (64 bit)
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