I recently upgraded my mid 2011 Mac mini to macOS High Sierra. I purchased the Magic Mouse 2 about a year ago, but really loathe the charging port on the bottom (unbelievably stupid design, but I digress). As such, I kept my old (original) Magic Mouse handy for when I needed to charge the Magic Mouse 2. I never had problems with this use case in OS X El Capitan.
However, today when I tried to use the old Magic Mouse, macOS absolutely freaked out and neither of the Bluetooth mice could connect. I had to use a generic Logitech USB mouse to "forget" both of them (old and new), then I could reconnect the Magic Mouse 2 after it charged.
So my question: is the original Magic Mouse unsupported in macOS High Sierra? (edit: it definitely is supported, not the issue). Or perhaps I simply can no longer use the Magic Mouse and Magic Mouse 2 interchangeably?
Update 1: Forgetting and re-pairing both of the the mice was a temporary fix. Nothing else worked, including rebooting.
Update 2: Issue has returned. I again had to fight macOS tooth-and-nail to get the Magic Mouse 2 paired after using the Magic Mouse!
Update 3: One thing I forgot to mention: when the Magic Mouse 2 has lost pairing (after using the Magic Mouse) and I plug it in and switch it on, the "Mouse" section of System Preferences goes absolutely berserk, rapidly alternating between the normal screen and the "looking for bluetooth mouse" screen.
Best Answer
1st Answer Alt. Using The Interface Answer (Credit user3439894)
(Short Way)
Does the command line version from my understanding.
Open Bluetooth Setup Assistant at startup if no mouse or trackpad is detected
"1st Answer Using Terminal/Commandline
My hypothesis, is I believe the bluetooth devices may be fighting.
If you don't mind a little terminal action, then, lets try turning off the Automatic Search for bluetooth.
Open
Terminal
and run: Update 2:This is not a mandatory step this will show up if you run After the write steps.This for me just returned:
So, I ran:
This should return 1, as it does on my machine. So, let's turn this off.
Doing some more research, I also found something similar, in other plist files.
But to change this is requires your admin password as it is part of the SIP protection.
Then, to make the changes take effect: (Thanks to user3439894 for the update from the comments.)
3rd Answer
Try using
blueutil
and let me know.4th Answer
Try "Reseting the System Management Controller (SMC) on your Mac."