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Last active June 19, 2024 08:46
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Macbook Pro Bluetooth + WiFi 2.4GHz interference fix for Mavericks

This is a well known issue, and it has a solution that is confirmed to work for the Mac side.

sudo defaults write /Library/Preferences/ bluetoothCoexMgmt Hybrid

After you run this script, the issue will go away and BT connections will remain stable.

And here is the explanation:

Background: after a lot of snooping and head scratching, here's what I found: the issue here seems to be that the system isn't using the same Bluetooth/Airport coexistance mode for BLE as it uses for BT Classic. One tell tale sign: if you have any BT Classic devices connected and active, the bug won't repro (neither for the Classic device nor any connected BLE device). The moment the Classic device disconnects, the bug repros (ie all the BLE connections are also dropped).

Further, I was able to find reference in the symbol table of an airport configd agent to an override setting for the coexistance mode. If you set the mode manually as above to 'hybrid' (the same mode that is usually invoked when a classic device is connected), the bug no longer repros.

All credits go to William Henderson from Knock for this trick.

There were cases when the same effect was perceived on iOS devices as well. This some times happens when the Core Bluetooth connections are not stable. Sometimes this can lead to the WiFi connection being unusable. But it's hard to reproduce, at least I wasn't able to, and your question does not concern it either.

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Hi, I'm using a magic mouse, mac keyboard and beats studio beats and the intermittence error in my hearing aids persists on my Macbook air 2021. Maybe because my mac keyboard is from 2009.

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gmagreti commented Mar 9, 2024

Apparently it worked on my Macbook Pro M1 Pro 2021

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Thanks a lot for that. Apparently solved my problem with BT Headsets and Logitech BT mouse issues... let´s see if remains fixed.

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