Bug#979729: Problem magically fixed itself...?

[Alex Relis]

Interestingly enough, I had a (probably unrelated) issue where 
WPA_Supplicant, plasmashell, and kworker were using 100% CPU, forcing me 
to reboot. And now upon reboot my Bluetooth works perfectly fine. I 
swear I didn't do anything else. Issue fixed on my end.