Mac doesn't go to sleep anymore

apple.stackexchange https://apple.stackexchange.com/questions/310800

Question

Since a while, probably the last system update, after inactivity, the screen won't go to sleep. The system itself is configured not to go to sleep, but the screen should, and it should lock then, but it doesn't.

There is a similar question here: My MacBook won't go to sleep anymore

$ pmset -g assertions
2018-01-01 17:22:20 +0100 
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    1
   PreventSystemSleep             0
   ExternalMedia                  1
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Listed by owning process:
   pid 111(hidd): [0x00029b5b00099302] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle.4294968026.3" 
    Timeout will fire in 300 secs Action=TimeoutActionRelease
   pid 574(AirPlayUIAgent): [0x0001717d0005a3c9] 38:38:30 PreventUserIdleDisplaySleep named: "com.apple.airplay.disableUserIdleDisplaySleep" 
    Details: disable user idle display sleep for AirPlay screen
   pid 61(powerd): [0x0000000600088000] 91:42:44 ExternalMedia named: "com.apple.powermanagement.externalmediamounted" 
No kernel assertions.
Idle sleep preventers: IODisplayWrangler

I've had this problem last week, then decided to restart. This solved the problem, until now. It seems to have to do with Bluetooth? I'm not sure yet.

Update: it is related to Airplay. Whenever I stream to Apple TV, this happens.

How can I get my screen to go to sleep automatically and fix this problem either permanently or temporarily without having to restart?

Was it helpful?

Solution

Launch the built-in Activity Monitor application and select the Energy tab.

Select View ▹ All Processes from the menu bar, if it's not already selected.

Also select View ▹ Columns ▹ Preventing Sleep (or Power Assertion)

Click the heading of the Preventing Sleep column to sort the process table. You'll see which process show "YES" in that screen.

OTHER TIPS

I have same issue. I quit the air play process and it works. Is this a bug?

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