User profile for user: chienlim
chienlim Author
User level: Level 1
16 points

Bluetooth module intermittently drop connection to all connected bluetooth devices (Magic Mouse/Keyboard, Speakers, etc.)

Systems:

iMac 27" Late 2013

macOS Mojave Version 10.14.5


Symptoms:

Bluetooth module intermittently drop connection to all connected bluetooth devices (Magic Mouse/Keyboard, Speakers, Sony Headphones, etc.). It will drop for 1~3 seconds and will then auto-reconnect. This problem happened after updating to Mojave Version 10.14.5. This is not a bluetooth devices issues, because all connected devices got disconnected at the same time.


Tried the following Bluetooth "Debug" section - holding [Shift]+[Option]+click on Bluetooth:

(1) Reset "Reset Bluetooth Module"

(2) Factory reset all connected Apple devices"

(3) "Remove all devices"

Results: Does not help.


Tried resetting SMC, PRAM, NVRAM

Results: Does not help.


Tried deleting apple.Bluetooth.xxx files

Results: Does not help.


Tried unplug all other USB devices

Results: Does not help

iMac 27", macOS 10.14

Posted on Jun 5, 2019 5:19 PM

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User profile for user: chienlim
chienlim Author
User level: Level 1
16 points

Posted on Jun 7, 2019 3:05 PM

How I concluded that my issue is not a mouse or keyboard issue?


  • Use the "Console" app to track the system log, to launch the app, go to Spotlight and type "Console" <return>
  • In the "Console" app, you will see a batch of messages constantly appended
  • In the search bar of the "Console" app, type "bluetooth" <return> or right click on "bluetoothd" process and show only "bluetoothd" process only (bluetoothd = bluetooth daemon, software service for bluetooth)
  • You may hit [Clear] to clear all previous activities.
  • Now, when your mouse or keyboard get randomly disconnected, you will see why


In my case this is what I see (just some part of it all):


default	21:26:14.116907 -0700	UserEventAgent	[BTUserEventAgentController messageTracerEventDriven] StateApple80211 4 4
default	21:26:14.116930 -0700	UserEventAgent	[BTUserEventAgentController messageTracerEventDriven] FlagsApple80211 0x00000010 0x00000010
default	21:26:14.116953 -0700	UserEventAgent	[BTUserEventAgentController messageTracerEventDriven] ConnectedDevices 1 1
default	21:26:14.120180 -0700	UserEventAgent	[BTUserEventAgentController messageTracerEventDriven] ConnectedDeviceTypes 0x0000000B 0x0000000B
default	21:26:14.118207 -0700	bluetoothd	INIT -- Host controller terminated
default	21:26:14.118229 -0700	bluetoothd	Host controller terminated
default	21:26:14.118259 -0700	bluetoothd	-[CBXPCManager hostControllerTerminated]
default	21:26:14.118278 -0700	bluetoothd	-[CBXPCManager hostControllerNotReady]
default	21:26:14.120216 -0700	bluetoothd	-[CBXPCManager hostControllerNotReady]
default	21:26:14.120699 -0700	bluetoothd	-[CBPowerManager updatePowerState:] - New State:0


What I am seeing is that, for no reason, Bluetooth Host Controller gets terminated (refer to line @ 21:26:14.118207 -0700)

And after 2-3sec, it will recover and you will see mouse and keyboard connected messages.


I don't get these messages when using external Asus Bluetooth Dongle.


I will continue to use the external Bluetooth Dongle until Apple fixed the Bluetooth Controller software

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Bluetooth module intermittently drop connection to all connected bluetooth devices (Magic Mouse/Keyboard, Speakers, etc.)

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