I have a Late 2012 iMac 27" i7 3.4Ghz with a 30" Cinema using the DisplayPort Adapter and a 27" Cinema. My computer will go to sleep and randomly (Every three times or so) awake very slow and missing the 27" Cinema (never the 30"). I can fix the problem by hitting the power and putting the computer back to sleep and reawaking the computer and it will run fine. Hopefully there will be a fix soon.
Hi Kyle, easily could be a bug, but I can't test it.
Open console in Applications>Utilities, check the system log for the date/time of the last problem & the Wakeup right after that for clues.
Did it again this morning. I went into the Power Management Log:
2/15/13 11:01:58 AM CST Assertions PID 121(coreaudiod) Released NoIdleSleepAssertion "com.apple.audio.'AppleHDAEngineOutputDP:0,1,0,1,0:0:{1006-9226-021ADB21}'.noid lesleep" 01:20:51 id:0x1000004f1 Aggregate:0x100240
Sleep/Wakes since boot:9 Dark Wake Count in this sleep cycle:8
Time stamp Domain Message Duration Delay
========== ====== ======= ======== =====
UUID: 73C91ACB-642C-49D6-AD75-7BE7CCE8DE1B
2/15/13 11:02:00 AM CST Sleep Power Button Sleep Sleep: Using AC 12 secs
2/15/13 11:02:00 AM CST SlowResponse Kernel: Response from powerd is slow 16000 ms
2/15/13 11:02:02 AM CST SlowResponse PMConnection: Response from mDNSResponder is slow (powercaps:0x0) 1485 ms
2/15/13 11:02:02 AM CST WakeRequests Clients requested wake events: [proc=mDNSResponder request=Maintenance inDelta=3321]
2/15/13 11:02:02 AM CST WakeRequests PM scheduled RTC wake event: MaintenanceImmediate inDelta=3321.00
2/15/13 11:02:12 AM CST Wake Wake due to EHC1/HID Activity: Using AC
2/15/13 11:02:18 AM CST Assertions PID 121(coreaudiod) Created NoIdleSleepAssertion "com.apple.audio.'AppleHDAEngineOutputDP:0,1,0,1,0:0:{1006-9226-021ADB21}'.noid lesleep" 00:00:08 id:0x100000a09 Aggregate:0x100242
2/15/13 11:02:44 AM CST Assertions PID 1011(diskmanagementd) Created PreventUserIdleSystemSleep "com.apple.diskmanagementd" 00:00:08 id:0x100000a2b Aggregate:0x100242
Total Sleep/Wakes since boot:10
I don't see any clues there as I'd hoped, I wonder, does the failure happen at a certain time of day, or certain a certain amount of sleep?
Late 2012 iMac Bug Found while running two extra displays.
