I've been fighting this for months and I can't seem to get it to sleep consistently. I've talked to Apple Support on the phone and they couldn't help me. I've taken it in and he guy got it to sleep but shortly after leaving, it did it again...
pmset -g after several attempts to get it to sleep and the following are reasons why it fails:
sleep 10 (sleep prevented by backupd-helper, powerd) sleep 10 (sleep prevented by apsd, powerd, powerd, backupd-helper) sleep 10 (sleep prevented by Google Chrome, Google Chrome) sleep 10 (sleep prevented by apsd, powerd, backupd-helper) sleep 0 (sleep prevented by coreaudiod)
As you can see, every time is a bit different but the culprits are generally the same. A full
pmset -g reads:
Active Profiles: Battery Power -1 AC Power -1* Currently in use: standbydelay 4200 standby 0 womp 0 halfdim 1 hibernatefile /var/vm/sleepimage gpuswitch 2 sms 1 networkoversleep 0 disksleep 10 sleep 10 (sleep prevented by backupd-helper, powerd) autopoweroffdelay 14400 hibernatemode 3 autopoweroff 1 ttyskeepawake 1 displaysleep 10 acwake 0 lidwake 1
pmset -g assertions
4/27/14, 4:06:16 AM CDT Assertion status system-wide: BackgroundTask 0 PreventDiskIdle 0 ApplePushServiceTask 0 UserIsActive 1 PreventUserIdleDisplaySleep 0 InteractivePushServiceTask 0 PreventSystemSleep 0 ExternalMedia 0 PreventUserIdleSystemSleep 0 NetworkClientActive 0 Listed by owning process: pid 46(hidd): [0x0000000a0000126e] 00:37:52 UserIsActive named: "com.apple.iohideventsystem.queue.tickle" Timeout will fire in 594 secs Action=TimeoutActionRelease Kernel Assertions: 0x4=USB id=501 level=255 0x4=USB mod=4/26/14, 4:21 PM description=EHC2 owner=AppleUSBEHCI
For a while it seemed that when my external monitor was connected, it wouldn't sleep but it happens also when my monitor is not connected. I've got it configured to go to sleep when my monitor is connected via the command
sudo nvram boot-args="iog=0x0" as I find it annoying to have to unplug my monitor when I want the laptop to go to sleep.
I've reset both the SMC and PRAM, which neither have helped. I've reset defaults for Energy Settings and unchecked allow incoming connections. I've even shut down nearly everything running and it just won't go to sleep! I usually have to shut down the laptop because I've gotten home from work before to find my laptop running quite hot from just closing the clamshell and heading home.