2018 MBP Bug: Charging Issue

schalliol

macrumors regular
Original poster
May 7, 2002
178
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Carmel, IN
Edit: We have uncovered three '18 MBPs all with the same bug highlighted below.

As I think is the case with USB-C MBPs, my '18 15" has a power chime that plays when the power is connected or the battery becomes full. This is irritating when I work and someone may be napping, and it's just plain not necessary. It appears that /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif is played in this case. I am unable (even as sudo in terminal) to delete or change this file. I just don't understand why there isn't an option to turn this feature off when the machine is muted.

Does anyone know a way around this? Thanks!
 
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iMacDragon

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Oct 18, 2008
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UK
As I think is the case with USB-C MBPs, my '18 15" has a power chime that plays when the power is connected or the battery becomes full. This is irritating when I work and someone may be napping, and it's just plain not necessary. It appears that /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif is played in this case. I am unable (even as sudo in terminal) to delete or change this file. I just don't understand why there isn't an option to turn this feature off when the machine is muted.

Does anyone know a way around this? Thanks!
It chiming when 'full' is a bug of some sort effecting only some laptops ( mine included ), what it's actually doing is reporting what it thinks is a power disconnect/reconnect.
 
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iMacDragon

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Mine only chimes when first plugged in. I like it as when the MBPro is closed and off, it is a positive indication that it is charging. Not an issue for me, it is a feature.
That's what it's supposed to be doing, but for us it's also erronously chiming when trickle charging/not charging full battery randomly.
 
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schalliol

macrumors regular
Original poster
May 7, 2002
178
43
Carmel, IN
That's what it's supposed to be doing, but for us it's also erronously chiming when trickle charging/not charging full battery randomly.
This is exactly it. I have it plugged in and closed when I’m sleeping someplace late and it chimes all night long periodically. It sounds like I’m not the only one on this. Is that right?

Does the system audio volume affect this? I just tried that, but it seems like this is independent from regular audio.
 

iMacDragon

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Oct 18, 2008
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This is exactly it. I have it plugged in and closed when I’m sleeping someplace late and it chimes all night long periodically. It sounds like I’m not the only one on this. Is that right?

Does the system audio volume affect this? I just tried that, but it seems like this is independent from regular audio.
I'm not sure, for now I've just either unplugged overnight or disabled sleep when screen turns off when plugged in, but I've opened a case with apple that I need to chase up on. It's a definite fault, but whether it's hardware or software is not yet clear.
 

iMacDragon

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It's not advanced enough to probably be of much use yet, only initial query and trying a reinstall, so for now just saying you know of other reports is probably good enough.
 

schalliol

macrumors regular
Original poster
May 7, 2002
178
43
Carmel, IN
Okay, thanks. I’m glad I’m not the only one. I haven’t heard this through by CalDigit TS3+ dock, only the included power supply.
 

iMacDragon

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OK, my issue has now been escalated up to engineering review to examine, I will hear back initial conclusion/further steps on saturday.
 

schalliol

macrumors regular
Original poster
May 7, 2002
178
43
Carmel, IN
Great to know. My issue is being explored now as well, but I'm not sure it's in engineering.

Interestingly, my cycling chime issue happens only on the provided Apple power adapter, and I don't have a problem on my CalDigit TS3+. It simply stays charged. Have you tried a different power adapter than Apple's?

Also, you could share my case (100596058368) with Apple for another datapoint.
 

iMacDragon

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Oct 18, 2008
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Unfortunately it's the only USB C charger I have so I can't eliminate that, but that is interesting. I'm not sure if thunderbolt power management is exactly same as USB C PD?

edit: ok, seems thunderbolt power is indeed USB-C PD as is. So there's some difference with how this is monitored then, perhaps charger status communication is different.
 
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BigMcGuire

Contributor
Jan 10, 2012
5,182
6,400
California
This is irritating when I work and someone may be napping, and it's just plain not necessary.
Haha, this is awesome. People nap where you work?

Hope it gets fixed.

I, for one, really miss the Wall-E startup sound... :(. I find the new charging sound to be annoying.
 
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