MacBook Pro 16" (2021) M1Pro Charging issue?

Just bought the 16" MBP M1Pro and noticed when I "shutdown" the MacBook, close the lid, plug in the supplied MagSafe charger to the Mac, the MagSafe indicator light flashes amber and making a connect/disconnect sound from the Mac. Now if the Mac is powered on, charging works as it should. Spoke with Apple Support on this and they have no clue on this type of issue. Anyone else experiencing this issue?

MacBook Pro (2020 and later)

Posted on Oct 28, 2021 1:24 AM

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Posted on Nov 3, 2021 1:42 PM

I skipped on sending it in for a replacement and followed a tip I found somewhere about the "Battery Optimization" feature. Don't even really understand what its supposed to do, my comprehension skills aren't the best but I guess its supposed to help with the battery life by following your charging habits. What I took it to mean is that it wont charge my laptop when I plug it in based on some arbitrary AI trying to track my sporadic and random habits of charging.


So.... Turned that feature off and I can safely say that my laptop charges whenever I plug it in, close the lid, shut down, etc. No more blinking on and off with the charger light going on and off. Works like normal.

I did also update after receiving it, i'll assume its the 12.0.1 (I'm not on that laptop right now to check but im sure Monterey hasn't had that many updates since I got the laptop a week ago.)


Hope this helps someone out.

109 replies

Nov 12, 2021 11:03 AM in response to theJahgy

The funniest part of this whole issue is that Apple (most valuable company in the world) who is probably already working on a fix for this can't bother to tell their support about the issue or acknowledge the issue at a very basic level. So instead they'll have customers of one of their most expensive products go to their stores where apple associates (who arent aware of the problem) will swap out entire units which cost in excess of two thousand dollars for the base model.


*shrug*

Nov 26, 2021 5:43 PM in response to Spiro Magoulas

Interesting that the power controller in the MacBook that is supposed to allow 5A @ 28V by using the extra pairs of wires normally reserved for data. The oscillations are due to the MacBook not handshaking properly by the power management controller, this is low level firmware. The chip is inside the PSU, an STM32 G0 microcontroller, it can be updated via its USB connection from the MacBook and I would assume Apple will update it eventually. Putting a protocol analyser on the port shows it basically panicking, this doesn't happen if the computer is running at the time, this suggests there is some kind of comms failure between the power management controller and the power supply that is absent when the computer is providing its own power. Of course, I HATE using the MacBook when it is being powered due to the tingly/stingy sensation from the aforementioned power supply, so I just leave it on the floor, split, plugged in and on to charge. Besides, closing the lid leaves the MacBook in some weird power state that throttles the performance massively when I open it (other threads complain about that issue)

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MacBook Pro 16" (2021) M1Pro Charging issue?

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