I occasionally leave my Mac mini on but with its screens off, the way my power settings is set.. the Mac should go into sleep mode after 15 minutes of inactivity.
I noticed tonight that this did not happen, and randomly an hour later the Macs fan started to spin up aggressively for a very brief period (5 seconds).
Could anyone tell me what this could be? Or is there a log that I can go through to see what was happening?
EDIT (as suggest by @AnonymousAppDev)
23/01/2014 01:30:46 GMT
Assertion status system-wide:
BackgroundTask 0
PreventDiskIdle 0
ApplePushServiceTask 0
UserIsActive 1
PreventUserIdleDisplaySleep 0
InteractivePushServiceTask 0
PreventSystemSleep 1
ExternalMedia 0
PreventUserIdleSystemSleep 1
NetworkClientActive 0
Listed by owning process:
pid 182(coreaudiod): [0x000000010000178c] 00:00:57 NoIdleSleepAssertion named: "com.apple.audio.'AppleUSBAudioEngine:Bose Corporation:Bose USB Audio:14200000:1'.noidlesleep"
pid 1063(VLC): [0x000000010000178d] 00:00:57 NoIdleSleepAssertion named: "VLC media playback"
pid 72(hidd): [0x0000000a0000178f] 00:00:43 UserIsActive named: "com.apple.iohideventsystem.queue.tickle"
Timeout will fire in 557 secs Action=TimeoutActionRelease
pid 1264(screensharingd): [0x000000080000175c] 00:02:50 PreventSystemSleep named: "Remote user is connected"
Kernel Assertions: 0x10c=USB,BT-HID,MAGICWAKE
id=500 level=255 0x4=USB mod=22/01/2014 20:59 description=XHC1 owner=AppleUSBXHCI
id=502 level=255 0x4=USB mod=22/01/2014 20:54 description=EHC1 owner=AppleUSBEHCI
id=504 level=255 0x8=BT-HID mod=01/01/1970 01:00 description=com.apple.driver.IOBluetoothHIDDriver owner=BNBMouseDevice
id=505 level=255 0x100=MAGICWAKE mod=23/01/2014 01:41 description=en0 owner=en0
I suspect it has something to di with either VLC or my USB Speakers?