When I sleep my MacBook Pro and then lift the lid to wake it, after several seconds I hear a double-beep. Here is a link to a recording of the sound.

I'm not positive that this is related to the 10.13.5 update, but it didn't happen before the update.

I would like to determine which process is responsible for this audio playback so that I can determine why it is happening.

  • Boot into Safe Mode, put the Mac to sleep and then wake it? Are the sounds still present? Also, test with a new user account. This will help determine if it's system wide and/or user related. – Allan Jun 8 '18 at 13:16
  • Hi @Allan. Thanks for responding. I'm aware of the process of elimination route, but is there a more direct route? Maybe a way to see which process uses audio output at a specific time? – jsejcksn Jun 8 '18 at 19:15

For me, it was calendar notifications. I noted the change when I upgraded to Mojave, that I got a notification sound whenever I opened the lid. I had the calendar notification set to NONE - so there was no visual alert, but I had left "Play Sound" checked. It appears that if you have any notifications for the day, calendar alerts you on opening the lid. I toggled on the visual alert to confirm and, yep -- it was calendar alerts. Turned off sound and all was well.

System Preferences > Notifications:

enter image description here

  • This is interesting. I do not use the native Calendar app. Is the sound you heard the same sound as the one linked in my question? (By the way, I am not hearing this sound any longer.) – jsejcksn Jan 31 at 13:10
  • No, it wasn't -- but I customized my alerts so I wouldn't expect it to be. Even though you don't use the native calendar app, the pattern may hold for some other notification: visual alert is off, sound is activated, and it's a status that the mac checks against notifcation automatically on lid open. – brianfit Jan 31 at 16:26

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