Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 3 PID: 3969 at drivers/base/firmware_class.c:1114 _request_firmware+0x558/0x810()
Modules linked in: rfcomm fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep binfmt_misc rtsx_usb_ms memstick arc4 brcmsmac snd_hda_codec_hdmi cordic brcmutil b43 intel_rapl mac80211 btusb iosf_mbi cfg80211 bluetooth snd_hda_codec_conexant snd_hda_codec_generic ssb x86_pkg_temp_thermal uvcvideo coretemp videobuf2_vmalloc videobuf2_core videobuf2_memops v4l2_common iTCO_wdt iTCO_vendor_support videodev snd_hda_intel
 snd_hda_controller snd_hda_codec media snd_hwdep snd_seq bcma snd_seq_device kvm snd_pcm crct10dif_pclmul snd_timer snd soundcore ideapad_laptop crc32_pclmul shpchp crc32c_intel sparse_keymap rfkill ghash_clmulni_intel mei_me lpc_ich joydev mei i2c_i801 nfsd auth_rpcgss nfs_acl lockd grace sunrpc rtsx_usb_sdmmc mmc_core rtsx_usb mfd_core i915 i2c_algo_bit drm_kms_helper serio_raw drm alx mdio video
CPU: 3 PID: 3969 Comm: kworker/u17:0 Not tainted 4.0.4-202.fc21.x86_64 #1
Hardware name: LENOVO 2189/INVALID, BIOS 5ECN92WW(V8.04) 09/14/2012
Workqueue: hci0 hci_power_on [bluetooth]
 0000000000000000 00000000e9fadc4f ffff880233587b78 ffffffff8177c898
 0000000000000000 0000000000000000 ffff880233587bb8 ffffffff8109d5ea
 0000000000000000 ffff880233587cd0 00000000fffffff5 ffff8802200f8900
Call Trace:
 [<ffffffff8177c898>] dump_stack+0x45/0x57
 [<ffffffff8109d5ea>] warn_slowpath_common+0x8a/0xc0

Potential duplicate: bug 1046975