iMac:~ huanghaoyuan$ sudo pmset -g assertions
Password:
2018-09-16 23:09:25 +0800
Assertion status system-wide:
BackgroundTask 1
ApplePushServiceTask 0
UserIsActive 1
PreventUserIdleDisplaySleep 0
PreventSystemSleep 0
ExternalMedia 1
PreventUserIdleSystemSleep 0
NetworkClientActive 0
Listed by owning process:
pid 53(powerd): [0x0000002200088000] 00:05:37 ExternalMedia named: "com.apple.powermanagement.externalmediamounted"
pid 64(mds): [0x0000002b000b800c] 00:05:28 BackgroundTask named: "com.apple.metadata.mds.power"
pid 97(hidd): [0x0000003c00098061] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle.4294968052.3"
Timeout will fire in 600 secs Action=TimeoutActionRelease
Kernel Assertions: 0xc=USB,BT-HID
id=502 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d130000 owner=IT-CEO USB Device
id=504 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d110000 owner=USB 2.0 Hub
id=506 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d150000 owner=USB Receiver
id=507 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d120000 owner=Webcam C170
id=508 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d114000 owner=USB 2.0 Hub
id=510 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1d114400 owner=1
id=513 level=255 0x4=USB mod=01/01/1970, 8:00 AM description=com.apple.usb.externaldevice.1a130000 owner=Bluetooth USB Host Controller
id=514 level=255 0x8=BT-HID mod=01/01/1970, 8:00 AM description=com.apple.driver.IOBluetoothHIDDriver owner=AppleHSBluetoothDevice
id=515 level=255 0x8=BT-HID mod=01/01/1970, 8:00 AM description=com.apple.driver.IOBluetoothHIDDriver owner=AppleBluetoothHIDKeyboard
Idle sleep preventers: IODisplayWrangler
iMac:~ huanghaoyuan$