Bluetooth issue on iMac

[imyelmo]

Lately, I don't remember if after 10.13.3 or 10.13.4 update I have sometimes bluetooth issues. The fact is that bluetooth doesn't turn off on iMact aftwer display switching; thus, keyboard and mouse remain attached to the iMac and are not syn with my Macbook Pro. Any idea about how to deal or debug this issue?

[AntonTal]

I have the very same issue - bluetooth on iMac won't turn off when a macbook is connected. I use iMac 2010 27, 10.12.6 and a MacBook Pro 2016 15, 10.13.4. The target display mode is over mini-display rather than thunderbolt.

[SoneeJohn]

@imyelmo @AntonTal Please see if the latest version fixed you issue here

[AntonTal]

Unfortunately, this update doesn't fix the problem. What I've noticed is that on the iMac it says: "Host Mode: Ready to accept connections" regardless whether the display is in target mode or not, even after manually switching the target mode on/off with cmd+f2 shortcut. I guess it simply doesn't recognise the connection. On the MacBook it still works as it should - turn on/off Bluetooth depending on the connection.

[SoneeJohn]

@AntonTal Can you please repeat the steps you did above then go to advanced > Save Debug logs on both the iMac and MacBook, then attached them to your comment here on GitHub.

[AntonTal]

Here they are. What I also noticed is that whenever I launch KVM - Bluetooth switches off even on iMac. Furthermore, often VirtualKVM crashes when I manually switch Bluetooth on on the iMac.
macbook.log
imac.log

[SoneeJohn]

@AntonTal From the logs it appears that the iMac is indeed detecting the presence of the thunderbolt cable. Are you using an Apple keyboard with your system?