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New macbook Pro M1 chip waking when asleep with log "SMC.OutboxNotEmpty" wake reason

My new Macbook Pro with the M1 chip, when sleeping and on battery, will slowly drain. I looked at the logs and the wake reason is:


"Wake reason = wlan, kern.wakereason: 'SMC.OutboxNotEmpty smc.70070000 wifibt wlan"


This happens every few minutes or so in the log.


I checked the system preferences and Wake for Network access is OFF.


Never had this issue with prior MacBooks, until the new M1.


Any ideas?

MacBook Pro 13″, macOS 11.0

Posted on Nov 18, 2020 12:17 PM

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Question marked as Top-ranking reply

Posted on Nov 23, 2020 6:56 AM

I have the same issue. This is the stats I got in the morning.

This is really more than annoying since it wakes up the external monitor to which the Mac is connected every few minutes.


Apple folks, please respond to this.

45 replies

Jan 23, 2021 11:29 AM in response to jfdubestripe

After continuous investigation and research, I found that it was the problem of powernap. It's not bigsur's bug that cause external devices wake up automatically. Unlike other Intel MacBook,powernap can't be completely disabled on M1.

Typing the command in terminal.app "pmset -g log | grep darkwake" to view the darkwake log, I found that two events caused my m1 MacBook Pro to wake up. As follows:


1. DarkWake from Deep Idle [CDNP] : due to SMC.OutboxNotEmpty smc.70070000 wifibt wlan/ Using AC (Charge:100%) 6 secs

2.DarkWake from Deep Idle [CDNPB] : due to NUB.SPMISw3IRQ nub-spmi.0x02 rtc/Maintenance Using AC (Charge:92%) 45 secs


Both events are caused by M1 MacBook forcing powernap to be enabled. But we also have a solution (need to upgrade to the latest macOS 11.2 RC):


1.Run command in terminal: sudo pmset -a tcpkeepalive 0

2.Run command in terminal: sudo pmset -a powernap 0


It's not over yet, because another process will still wake up in darkwake mode. To shut down this process, first you need to disable SIP: https://developer.apple.com/documentation/security/disabling_and_enabling_system_integrity_protection

Then run command in terminal: sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.PowerUIAgent.plist


BTW,do not re-enable SIP or last command will be invalid.The recovery mode of M1 is different from Intel, please search for it yourself.

Jan 29, 2021 3:56 AM in response to chrisia777

These two commands + disabling "Wake for network access" worked for me perfectly. Waking up every few minutes stopped, there is no battery drain over night now. Thank you chrisia777!


Jan 23, 2021 10:25 PM in response to chrisia777
I've found out an easier way to sovle this issue:
1.Run command in terminal: sudo pmset -a tcpkeepalive 0
2.Run command in terminal: sudo pmset -a powernap 0
3.Make sure these options is not checked: "System Preferences->Battery->Optimized battery charging" and "System Preferences->Battery->Power Adapter->Wake for network access"


The only downside with tcpkeepalive turned off is a warning you get when issuing the command that Find My might not be working properly, but I guess during pandemic and lockdown I will have lesser chance of my macbook being stolen or lost.


Now when my macbook is sleeping, battery is not used at all (it behaves the same as macbook being turned off). You can see this in this figure:

Jan 6, 2021 6:42 AM in response to jfdubestripe

Is there any other reason for this? I have no devices connected to the laptop, and no charger plugged in. Just the laptop alone. It keeps waking up every and sleeping after few seconds.

Two different reasons:

  • NUB.SPMISw3IRQ nub-spmi.0x02
  • SMC.OutboxNotEmpty


Why does this happen?


2021-01-06 04:44:40 -0500 DarkWake              DarkWake from Deep Idle [CDNP] : due to NUB.SPMISw3IRQ nub-spmi.0x02 rtc/SleepService Using BATT (Charge:100%) 4 secs
2021-01-06 04:44:44 -0500 Sleep                 Entering Sleep state due to 'Sleep Service Back to Sleep':TCPKeepAlive=active Using Batt (Charge:100%) 374 secs
2021-01-06 04:50:58 -0500 DarkWake              DarkWake from Deep Idle [CDNP] : due to SMC.OutboxNotEmpty smc.70070000 wifibt wlan/ Using BATT (Charge:100%) 5 secs
2021-01-06 04:51:03 -0500 Sleep                 Entering Sleep state due to 'Maintenance Sleep':TCPKeepAlive=active Using Batt (Charge:100%) 933 secs

Jan 25, 2021 11:17 AM in response to chrisia777

Thank you for your assistance here. Just two quick points

  1. Has a Radar been filed about this issue? If not, one should be filed so that this can be addressed in a future OS update
  2. Can you explain what those commands do, and how to reverse those changes:
sudo pmset -a tcpkeepalive 0
sudo pmset -a powernap 0

I presume running the following will reverse the changes:

sudo pmset -a tcpkeepalive 1
sudo pmset -a powernap 1

Jan 29, 2021 3:18 AM in response to chrisia777

Tried your instruction but not solving the issue. The difference is now the usage of history does not show anything but the battery icon shows it drained battery like before. 

After many conversations with Apple support and giving the laptop to Macforum, they promised me to refund the laptop but again they called me saying it is not possible to refund it and I have to send the laptop to another service center !!!.

This is the last time I bought something directly from Apple. Very disappointed support.




Feb 6, 2021 1:17 AM in response to chrisia777

After several conversations with apple support they sent the computer to a repair center in Czchek and they returned the laptop after one day.I have been told the issue has been resolved. Not only the issue has not been solved, Now I have two scratches on the body on my new laptop.

Disappointed service from apple. Never buy apple products directly from Apple.


Jan 4, 2021 7:38 PM in response to Meteo07

I solved my issue. I was using the MacBook Pro in clamshell mode connected to an external monitor through the thunderbolt port. My external monitor has a speaker. For some reason, this speaker was assigned to play system alerts.. so when Mac is sleeping and when the display is sleeping if Mac plays an alert, it wakes up the monitor. I ran the midi setup app under utilities and changed the alert audio device to internal speakers. Now my display doesn’t wake up anymore.

New macbook Pro M1 chip waking when asleep with log "SMC.OutboxNotEmpty" wake reason

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