4th Gen 2020 M1 Mac mini bluetooth issues with Magic Mouse2

I have the same error on external ASUS USB-BT400 dongle, while opening bluetooth status window in Bluetooth Explorer on my MacBook Air:

updateChainPower error: -3903

2021-01-27 09:52:47 +0000 Apple80211Get(APPLE80211_IOC_BTCOEX_MODE) returned error -3903

updateChainPower error: -3903

Also I get crashes of Bluetooth Explorer every time I connect new device via BT dongle.

Apart this I have no any issues using ASUS USB-BT400 dongle and Apple Magic Mouse 2.

mmulet3, this is very disappointing. When you reported this to Apple via Feedback Assistant, were the automatically generated system logs attached to your response? I would hate for Apple to release 11.2 without the fix.

I bought my M1 Mac Mini through Costco, so have 3 months total to return my Mac, which leaves me 1 more month to see if any issues materialize or return. I will submit more feedback to Apple to let them know that you and others are still experiencing continued BT problems despite the 20D62 build.

Yes. I just migrated 2 weeks ago from MacPro 5,1 to MMM1. I using 33" LG HDTV and 33" LG UHD Monitor both by HDMI (1 from MMM1 and 1 from USB-C hub adaptor) I have difficulty attaching a third monitor/TV as MMM1 only supports 2 mons, attaching a third by any port in anyway does not work. I have also used display port enable USB adaptor ... sometimes it works and some times it does not ... temperamental. I am also wandering if all the MM1 ports being fully utilised with mons and hubs etc. is cause and effect for the odd bluetooth behaviour ... but anyway, yes, no issues for 33" mons on MMM1.

I've installed the latest 11.2 beta as well as iOS 14 on my iPhone.

Everything was working 100% fine for two straight days - most I've had since I got my M1 Mac Mini. Then today - back to square one. No disconnections but laggy keyboard and mouse. FML

I agree; I've gone 24 hours now since the last upgrade (and upgraded both iphone and Apple Watch), and no issues so far. First time I've been able to use the computer for a full day since I received it!

I also received the Asus BT500 dongle today, but will hold off on trying it since things are working so far (and don't want to mess it up).

Keeping my fingers crossed, but so far so good!

Has anyone else noticed bluetooth devices being removed from user accounts when a second user signs in? My wife and I both have our own user accounts and iCloud accounts. When she signs in to her user account on the Mac her AirPods go on to my account and delete my Beats Solo Pro headphones from my iCloud account. I am going mad trying to figure it out.

I have the same bluetooth issue. I have the new Apple Trackpad and this drops connection at the same time as my Logitech mouse and keyboard.

Only started in last 24 hours (30 Jan 2021 and no issues since I bought in December 2020.

Will Apple accept return and refund under warranty?

No. I bought two Mac mini M ones in December and brought one to the Genius Bar. They kept it for 24 hours and called me to say that the hardware appeared to be fine. So they would not refund me. I sold the two minis at a substantial loss and purchased two PowerBook pros.

Thanks for doing this.

Even though I’m experiencing this less frequently, it’s still troubling when it occurs. It can be hard to get the BT connections established quickly and it interferes with work.

What version of macOS are you using? I am on 11.1 and just experienced a complete bluetooth connection shutdown (all my bluetooth devices connected to Mac mini lost connections). Have to restart to get it fixed.

I have never experienced issues with my Apple Watch unlocking my Mac M1 mini it’s worked from the getgo and in all versions (e.g 11.01, 11.1 and 11.2)

In order for the unlock feature to work using your Apple Watch you have to have:

1. your Mac has wifi and Bluetooth turned on
2. your Mac and Apple watch are signed into iCloud with the same Apple ID and that Apple ID has two factor authentication enabled
3. your Apple Watch us using a passcode

The Apple Watch unlock does not work well if you have two users on the machine. Once the second user logs in then Apple Watch unlock does not work reliably. That’s even with their account using their own iCloud and their Apple Watch not set to unlock their own account.

My mini isn't Mac silicon yet, but the Asus dongle is still working fine. I've done all the device updates, all the Macs are on 11.2. When I unplug the Asus dongle I still get the odd issue but its way better. Its beyond my comprehension how such an issue can be fixed in software alone but it seems like that is the case. Wouldn't it be great if Apple "fessed up" when they release an update "We have fixed XY and Z and we are sorry for the inconvenience". My M1 MBA ,for example. I needed to slightly reduce the levels of security for an app which required holding down the power button to enter recovery mode. (CMD+R has worked for me since the late 90s but it doesn't work now). Before 11.2 holding the button didn't work. Now it does. Transparency is a fine thing Apple, give it a try

Artiste212,

Thank you. The goal was to put the iMac to pasture, but I haven't had the time to get everything off it so I had been just doing a full shutdown before trying to reconnect. I was also trying to avoid buying another keyboard / mouse, but I think I'll keep iMac as an "around the house" computer and just make sure each have dedicated components. I haven't seen the otherwise intermittent drops and don't have any major issues with bluetooth even on restarts - as I'm currently having to do for software upgrades and installs. Thanks!!

Yesterday I have been contacted by Apple Support to investigate my issue (ie lagging mouse rather than disconnects). A very friendly Apple engineer interviewed me by phone and wanted as many details as possible. In addition I received instructions how to obtain log files when the problem occurs and send them to Apple. I have just submitted the first log file.

The expectation is that the problem can be solved by a software change (ie not hardware).

It shows Apple engineers do keep an eye on the discussions and identify users/cases who/which may be helpful in solving issues. Keep my fingers crossed.