I had an issue with an old Lenovo X260 laptop. The onboard bluetooth device was showing as not being present if the wireless device was loaded. I could have one or the other, but not both. BT/Wifi was being supplied by the same M.2 card, so as soon as a module loaded (the wireless loaded first I guess) it prevented it from being used by another module. I'm not sure if there was an actual fix to that, though. I had a spare USB bluetooth dongle so I just ran that instead.