Bluetooth Issues after Yosemite upgrade.

I too, ran into Bluetooth connectivity issues, unfortunately for me I lost connection to my wireless keyboard at the login screen! Interesting (or weirdly) my Bluetooth (BT) Magic Mouse, BT Trackpad, and my BT numeric pad all were working in the login screen! :-P What I had to do was grab my old USB keyboard, plug it in after which I was able to enter my logon password. Once I logged in the BT Wireless keyboard worked fine! Hopefully, if you should run into this problem, this will help resolve your issue.

I have a possible update to this problem here.

Good, it seems I am not the only one with the "reconnect-all-bluetooth-devices-every-XX-minutes-or-on-restart" dance and routine. It is becoming tiresome.

I was one of those reporting bluetooth connection, wifi recognition, and general speed and performance issues right after the upgrade completed. But after about an hour everything worked itself out. I can now attest that for the 48 hours since then I have had no problems attributable to the upgrade. My bluetooth Magic Tracpad stays connected and performs as well as it ever has. It's almost as if my Macbook Pro had to take a bit of time to digest the new OS. ScottL7's link (above) to another thread indicating that the conversion to FireVault2 may have caused and may explain this disruption in performance and its eventual resolution. It is understandable that such a big change may take a bit of time to process and complete, but it would have been nice to have a bit of a heads up from Apple before starting the upgrade. For that first hour or so, I definitely had misgivings and thoughts of, "OMG, what have I done?"

great for you but unfortunately still no change here.

Bummer for those that it did not work. PRAM worked the first time, though it sounds like it might have just been Filevault setting up and completing prior to PRAM set. Either way, no connection problems since. Good luck to all who are still having problems.

I have same issues with my BT Keyboard.

After install Yosemite and reconnected all BT devises my MB Pro show phenomena as follow,

1) BT Keyboard response for input password.

2) After logon BT keyboard will disconnected

3) After pair and reconnected it will going to normal operation.

4) After shutdown and turn on we can use BT keyboard to input password after phenomena will be going to item 2) 3) 4) and 1) .......

It not only happen for BT Keyboard but for all BT devises, that I connected.

Question. could be said that this wrong behaviour applies more in general with every BT device? sinche the update of yosemite i'm no more able to pair my iPhone (iOS 8.1) in order to hotspot the connection of the phone.

I think there are major issues in general with all the wifi connections (real WIFI or Bluetooth as well) in pairing with external devices.... (for example, also personal Hotspot doesn't work, since the iPhone is not listed in the WiFi available network...

There is definitely an issue. My Bose Soundlink Mini BT speaker keeps stalling. Mavericks was oK

I upgraded to Yosemite today and discovered that the Bose Color SoundLink is missing from the toolbar. The only way to access it is by going in to Sound through System Preferences which is pretty non-user friendly and antiquated. I hope Apple fixes this.