Macbook doesn't go to sleep, how to debug?

[hyperknot]

Hi, how can I debug why doesn't my Macbook go to sleep? Usually it works, but sometimes it doesn't.

When it doesn't work:
- the external display stays on forever
- clicking the Sleep button in the Apple menu doesn't do anything

macOS is 14.7

I tried this command while clicking sleep:

pmset -g assertionslog|grep -i sleep
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             1
   PreventUserIdleSystemSleep     1
   InternalPreventSleep           1
   pid 398(WindowServer): [0x0000947b000782f8] 00:00:42 PreventSystemSleep named: "com.apple.WindowServer.DMGrace"
   pid 391(bluetoothd): [0x000094a40001835f] 00:00:01 PreventUserIdleSystemSleep named: "com.apple.BTStack"
   pid 344(powerd): [0x0000947b000d82f7] 00:00:42 InternalPreventSleep named: "com.apple.powermanagement.acwakelinger"
10/07 23:54:03   Released    00:00:03  PreventUserIdleSystemSleep    391                 0x94a40001835f      com.apple.BTStack
10/07 23:54:03   System wide status: PreventUserIdleSystemSleep: 0
10/07 23:54:04   TimedOut    00:00:45  InternalPreventSleep          344                 0x947b000d82f7      com.apple.powermanagement.acwakelinger
10/07 23:54:07   Created     00:00:00  PreventUserIdleSystemSleep    433                 0x94ac00018367      Mutexed Backup Block
10/07 23:54:07   System wide status: PreventUserIdleSystemSleep: 1
10/07 23:54:08   Released    00:00:00  PreventUserIdleSystemSleep    433                 0x94ac00018367      Mutexed Backup Block
10/07 23:54:08   System wide status: PreventUserIdleSystemSleep: 0
10/07 23:54:10   Created     00:00:00  PreventUserIdleSystemSleep    433                 0x94af0001836c      Mutexed Backup Block
10/07 23:54:10   System wide status: PreventUserIdleSystemSleep: 1
10/07 23:54:10   Released    00:00:00  PreventUserIdleSystemSleep    433                 0x94af0001836c      Mutexed Backup Block
10/07 23:54:10   System wide status: PreventUserIdleSystemSleep: 0
10/07 23:54:13   Created     00:00:00  PreventUserIdleSystemSleep    391                 0x94b20001836d      com.apple.BTStack
10/07 23:54:13   System wide status: PreventUserIdleSystemSleep: 1
10/07 23:54:15   Released    10:58:01  PreventUserIdleDisplaySleep   443(2285)           0x10c600058ad1      com.apple.audio.context616.preventuseridledisplaysleep
10/07 23:54:15   Released    10:58:01  PreventUserIdleSystemSleep    443(2285)           0x10c600018ad0      com.apple.audio.context616.preventuseridlesleep
10/07 23:54:15   Released    10:58:01  PreventUserIdleDisplaySleep   443(2285)           0x10c600058ad5      com.apple.audio.context617.preventuseridledisplaysleep
10/07 23:54:15   Released    10:58:01  PreventUserIdleSystemSleep    443(2285)           0x10c600018ad4      com.apple.audio.context617.preventuseridlesleep

 

[hyperknot]

I shut down the computer, plugged it out, in, started again and now with working sleep this is what it says:

PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   PreventUserIdleSystemSleep     1
   pid 345(powerd): [0x000002b400018700] 00:00:54 PreventUserIdleSystemSleep named: "Powerd - Prevent sleep while display is on"
   pid 392(bluetoothd): [0x000002e600018787] 00:00:04 PreventUserIdleSystemSleep named: "com.apple.BTStack"

Most notably is the missing WindowServer line: PreventSystemSleep named: "com.apple.WindowServer.DMGrace"

I guess it'll come back in a few hours/days.

 

[Bigwaff]

how can I debug why doesn't my Macbook go to sleep?

You can install Sleep Aid. Will help you diagnose issue

Sleep Aid - View a Mac's sleeping habits, solve issues, improve battery life, stop sniffers

Sleep Aid is designed to reveal details on how a Mac sleeps. This is useful to see what's going on, and to help troubleshoot why a Mac won't go to sleep (even with lid closed), or why it keeps waking in the middle of the night. Sleep Aid includes many Apple sleep settings, as well as some...

ohanaware.com

 

[hyperknot]

You can install Sleep Aid. Will help you diagnose issue

Sleep Aid - View a Mac's sleeping habits, solve issues, improve battery life, stop sniffers

Sleep Aid is designed to reveal details on how a Mac sleeps. This is useful to see what's going on, and to help troubleshoot why a Mac won't go to sleep (even with lid closed), or why it keeps waking in the middle of the night. Sleep Aid includes many Apple sleep settings, as well as some...

ohanaware.com

Thanks a lot, I didn't know this app existed!