Hello,
my MBP 2021 connected to the new Studio Diplay (via thunderbolt) draws typically 15W when sleeping (this may take a while, it starts with lower consumption of 3-5W). The left fan of the display is running then, too.
When I disconnect the display from the Mac they consume only less than 0.5W each.
The OS are up to (Monterey 12.3.1 & IOS 15.4)
Any thoughts on that?
So, contacted Support (first time using iMessage which is cool)
Couple of things we tried:
They are going to pass my case up to a Senior Engineer to collect some more data from me.
Interestingly, I've ran this command in Terminal, found on another thread there:
pmset -g log | grep -i "wake from"
and I can see lots and lots of messages like the below, literally throughout the day/night when the Mac is supposed to be asleep...
DarkWake from Deep Idle [CDNP] : due to SMC.OutboxNotEmpty smc.70070000 wifibt wlan DataFrame ARPT/ Using AC (Charge:100%) 45 secs
My gut is telling me the Mac isn't fully going to sleep, or it's not going into a deep enough sleep for the power saving to kick in... this looks to be caused by network activity on mine.
I do remember an issue earlier in the year that was related to a similar thing but that was supposedly resolved in macOS 12.2 - maybe the bug(s) have come back.
Be interesting to see if you or anyone else notices those errors in Terminal or not, I'll post when I next speak to support.
So, contacted Support (first time using iMessage which is cool)
Couple of things we tried:
They are going to pass my case up to a Senior Engineer to collect some more data from me.
Interestingly, I've ran this command in Terminal, found on another thread there:
pmset -g log | grep -i "wake from"
and I can see lots and lots of messages like the below, literally throughout the day/night when the Mac is supposed to be asleep...
DarkWake from Deep Idle [CDNP] : due to SMC.OutboxNotEmpty smc.70070000 wifibt wlan DataFrame ARPT/ Using AC (Charge:100%) 45 secs
My gut is telling me the Mac isn't fully going to sleep, or it's not going into a deep enough sleep for the power saving to kick in... this looks to be caused by network activity on mine.
I do remember an issue earlier in the year that was related to a similar thing but that was supposedly resolved in macOS 12.2 - maybe the bug(s) have come back.
Be interesting to see if you or anyone else notices those errors in Terminal or not, I'll post when I next speak to support.
Disable Sleep, it’s unnecessary on later Macs, all pain, no gain. To disable, set your Energy Saver settings to as shown:
Separately, avoid manual sleep, use screen lock instead or let the display switch off/auto-lock on timer. For long or overnight absences, shut.
I am also noticing this behaviour, I can understand the fans needing to run when the display is on... but not when it's asleep and charging a MacBook (which is also asleep)
Have you raised a ticket with Apple to check this is expected behaviour?
I think, the fans only should be running when the MacBook Pro needs lots of power wenn charging. All external power adapters are fine with passive cooling (up to 120W). The Studio Display alone consumes only 30W.
Yes, I raised a ticked, they didn't know if it's an expected behaviour. The case is ongoing.
When I connect a fully charged iPad Pro in sleeping mode to the display, it too consumes about 15 W of power.
This is clearly a violation of the environmental report. It states it should consume 0.36W (plus 0.3W for the MBP) when at sleep.
Other people experience the same: https://www.reddit.com › commentsStudio Display problem (fans always on with Macbook pro ) : r/apple - Reddit
That is super interesting, and thanks for the link! I might create a case with Support as well so they know it's potentially wider than just you :)
Hopefully it's something that can be fixed in software.
Thank you so much, that‘s so interesting!
Strangely enough the MBP at sleep does consume less than 2W when connected to an external power adapter (and if I remember correctly, also much less power when connected to one of the USB-C ports and not the thunderbolt port of the studio display). So until now I thought the studio display is the culprit, not the MBP. As I said before also the iPad Pro consumes triggers this is due to display to consume 15-20 W when connected to the Thunderbolt port. I also noticed that sometimes it takes up to an hour until it reaches the maximum power consumption.
It is weird, I wonder if you disable Siri on the iPad it still does it?
I've noticed as well, with Siri disabled the display does definitely shut off - it just come back on and goes off (weirdly for 45seconds at a time...)
It does seem as well, that with Siri disabled the monitor takes about 2 seconds to come on when I press the keyboard... when Siri is enabled, it is instant - as if the display is 'on' still.
A slight update, based on some testing:
This thread on MacRumors https://forums.macrumors.com/threads/mba-constantly-waking-up-from-sleep.2271425/page-2 explains that the MacBook Air could be waking up because of 'TCPkeepalive'
I've disabled this, which does bring some feature reduction (like FindMyMac)
Run command in terminal: sudo pmset -a tcpkeepalive 0
This seems to have stopped my Mac waking and connecting to the network constantly.
I still feel this is a bug with either the Studio Display or macOS.. as there should be no need for the fans to be on to power a Mac in sleep mode...
No, they didn't, I tested this a few weeks ago with the Apple support who asked me to try this. I ran a few more tests with my iPad Pro 2020: Regardless if the iPad is on or in sleep mode, it draws 26 to 31 W when connected to the studio display. When I shut it down completely it still draws (or better the display) 7W. When I turn off Siri the only difference is, it consumes a little less when in sleep mode: 15 to 24 W. Only when completely shut down the fans turn off, otherwise both of them always run!
My MacBook Pro connected to the display draws 47-55 W, when turned on, without Siri. I first thought it would take less energy with Siri turned off, but it only took longer (about an hour) before the power consumption reached again 15-22 W.
To me it's 100% this studio display is play who is the culprit and consumes the power, because when I connect my MacBook Pro to the power adapter (96W) that came with it, it draws only 2.3 W in sleep mode!!
There a times in sleep mode, when only 7W is consumed. This is usually within the first hour, then none of the fans is running. But when the display draws 15-22W typically one fan, sometimes both fans are running.
Not making much progress on this, had a call with a support person and we're to the "try to reinstall macOS" stage, which I don't think will do anything...
Got to the point where I'm disconnecting my MacBook Air of an evening... which is a bit naff
Tempted to just wait and see if the next iOS update fixes anything :(
Same with me. I had an appointment with an apple supporter it but he didn't keep it and didn't call back.
I'm quite sure it's not the macOS, but the iOS of the Studio Display, too.
I'm flying to the Canary Islands tomorrow today, so I'll be off for a while.
Neither does that reduce the power consumption nor does it stop the the fan from running.
If that's what you want, shut everything.
Thank you, yes I think it‘s a good idea to open another ticket. Please keep me/us posted here!
High power consumption of MBP and Studio Display when sleeping
