Ubuntu 15.10
$ uname -a
Linux zwker-book 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Before i login my desktop,the screen print out the following message :

Bluetooth: hci0 exiting Intel manufacturer mode failed (-110)

But i can type into my password to login.Then i use the command "dmesg|tail " get these message:

[  493.027315] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead.
[  635.957868] usb 1-7: USB disconnect, device number 4
[  635.958067] Bluetooth: hci0 sending frame failed (-19)
[  635.958176] Bluetooth: hci0: turning off Intel device LED failed (-19)

Anyone can help me to solve this problem.thanks!