[136845.835638] ------------[ cut here ]------------
[136845.835642] WARNING: CPU: 3 PID: 23541 at /build/linux-Yt3KqI/linux-3.13.0/drivers/base/firmware_class.c:1094 _request_firmware+0x531/0xb80()
[136845.835686] Modules linked in: pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) vmw_vsock_vmci_transport vsock vmw_vmci dm_crypt bnep rfcomm binfmt_misc cdc_mbim cdc_wdm cdc_ncm usbnet mii wl(POX) x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek kvm_intel snd_hda_codec_hdmi kvm btusb bluetooth crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_codec aesni_intel snd_hwdep dell_wmi snd_pcm aes_x86_64 sparse_keymap dell_laptop lrw snd_page_alloc gf128mul dcdbas snd_seq_midi glue_helper snd_seq_midi_event ablk_helper cryptd snd_rawmidi snd_seq joydev cfg80211 serio_raw snd_seq_device snd_timer lpc_ich snd mei_me mei shpchp soundcore ppdev mac_hid parport_pc lp parport hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper e1000e ahci drm sdhci_pci psmouse sdhci libahci ptp pps_core wmi video
[136845.835689] CPU: 3 PID: 23541 Comm: kworker/u17:0 Tainted: P        W  OX 3.13.0-101-generic #148-Ubuntu
[136845.835690] Hardware name: Dell Inc. Precision M4800/0FVDR2, BIOS A13 01/29/2015
[136845.835703] Workqueue: hci0 hci_power_on [bluetooth]
[136845.835705]  0000000000000000 ffff880153e19c48 ffffffff8172c3a9 0000000000000000
[136845.835707]  0000000000000009 ffff880153e19c80 ffffffff8106a71d ffff880153e19d5c
[136845.835708]  ffff8800c3bac480 ffff880153e19d50 0000000000000000 00000000fffffff5
[136845.835709] Call Trace:
[136845.835713]  [<ffffffff8172c3a9>] dump_stack+0x64/0x82
[136845.835715]  [<ffffffff8106a71d>] warn_slowpath_common+0x7d/0xa0
[136845.835716]  [<ffffffff8106a7fa>] warn_slowpath_null+0x1a/0x20
[136845.835718]  [<ffffffff814b0c41>] _request_firmware+0x531/0xb80
[136845.835719]  [<ffffffff814b12c4>] request_firmware+0x34/0x50
[136845.835722]  [<ffffffffa0272802>] btusb_setup_patchram+0x72/0x1c0 [btusb]
[136845.835728]  [<ffffffffa045bb85>] hci_dev_do_open+0x275/0x760 [bluetooth]
[136845.835731]  [<ffffffff81013558>] ? __switch_to+0xe8/0x4f0
[136845.835738]  [<ffffffffa045c660>] hci_power_on+0x40/0x180 [bluetooth]
[136845.835740]  [<ffffffff81086fb8>] process_one_work+0x178/0x470
[136845.835742]  [<ffffffff81087dd1>] worker_thread+0x121/0x410
[136845.835743]  [<ffffffff81087cb0>] ? rescuer_thread+0x430/0x430
[136845.835745]  [<ffffffff8108ebb9>] kthread+0xc9/0xe0
[136845.835746]  [<ffffffff8108eaf0>] ? kthread_create_on_node+0x1c0/0x1c0
[136845.835748]  [<ffffffff8173cea8>] ret_from_fork+0x58/0x90
[136845.835750]  [<ffffffff8108eaf0>] ? kthread_create_on_node+0x1c0/0x1c0
[136845.835750] ---[ end trace 77f7165bb9167821 ]---
[136845.835752] usb 2-1.5: firmware: fw-413c_8143.hcd will not be loaded
[136845.835753] Bluetooth: can't load firmware, may not work correctly