No idea, but honestly I can't be arsed anymore with new stuff when it's so unreliable.

This is from a few minutes ago (the timestamps are hours old, but that's because dmesg timestamps don't take into account sleep time)

[Sat Aug 5 13:46:21 2017] ------------[ cut here ]------------
[Sat Aug 5 13:46:21 2017] WARNING: CPU: 0 PID: 16026 at drivers/base/firmware_class.c:1225 _request_firmware+0x51f/0x8a0
[Sat Aug 5 13:46:21 2017] Modules linked in: ccm rfcomm fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun xt_addrtype nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ip_set nfnetlink ebtable_nat ebtable_broute ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 xt_conntrack ip6table_mangle ip6table_raw br_netfilter bridge stp llc overlay ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables cmac bnep sunrpc arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media btusb btrtl snd_soc_skl snd_soc_skl_ipc snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core dell_wmi wmi_bmof snd_soc_sst_match
[Sat Aug 5 13:46:21 2017] tpm_crb snd_hda_codec_hdmi snd_hda_codec_realtek snd_soc_core snd_hda_codec_generic snd_compress snd_pcm_dmaengine ac97_bus iTCO_wdt iTCO_vendor_support hid_multitouch mei_wdt dell_laptop dell_smbios dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ath10k_pci ath10k_core irqbypass crct10dif_pclmul crc32_pclmul mac80211 ghash_clmulni_intel intel_cstate intel_uncore intel_rapl_perf ath cfg80211 joydev snd_hda_intel snd_hda_codec rtsx_pci_ms snd_hda_core memstick snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd i2c_i801 soundcore hci_uart intel_pch_thermal mei_me btbcm idma64 btqca mei shpchp processor_thermal_device btintel intel_soc_dts_iosf intel_lpss_pci bluetooth wmi soc_button_array intel_vbtn tpm_tis tpm_tis_core ecdh_generic pinctrl_sunrisepoint
[Sat Aug 5 13:46:21 2017] rfkill int3403_thermal intel_lpss_acpi pinctrl_intel intel_lpss intel_hid int340x_thermal_zone int3400_thermal tpm acpi_als acpi_thermal_rel sparse_keymap kfifo_buf industrialio acpi_pad rtsx_pci_sdmmc mmc_core i915 crc32c_intel i2c_algo_bit drm_kms_helper serio_raw drm nvme nvme_core rtsx_pci i2c_hid video
[Sat Aug 5 13:46:21 2017] CPU: 0 PID: 16026 Comm: kworker/u9:0 Not tainted 4.13.0-0.rc3.git1.2.fc27.x86_64 #1
[Sat Aug 5 13:46:21 2017] Hardware name: Dell Inc. XPS 13 9360/0839Y6, BIOS 1.3.7 07/04/2017
[Sat Aug 5 13:46:21 2017] Workqueue: hci0 hci_power_on [bluetooth]
[Sat Aug 5 13:46:21 2017] task: ffff9d2bf69e8000 task.stack: ffffb77c07014000
[Sat Aug 5 13:46:21 2017] RIP: 0010:_request_firmware+0x51f/0x8a0
[Sat Aug 5 13:46:21 2017] RSP: 0000:ffffb77c07017c50 EFLAGS: 00010282
[Sat Aug 5 13:46:21 2017] RAX: 000000000000002c RBX: ffffb77c07017d18 RCX: 0000000000000000
[Sat Aug 5 13:46:21 2017] RDX: 0000000000000000 RSI: ffff9d2cff40e118 RDI: ffff9d2cff40e118
[Sat Aug 5 13:46:21 2017] RBP: ffffb77c07017cc0 R08: 0000000000000487 R09: 0000000000000007
[Sat Aug 5 13:46:21 2017] R10: fffff404518d9200 R11: ffffffff94313aed R12: ffff9d2c81d13ae0
[Sat Aug 5 13:46:21 2017] R13: ffffb77c07017d10 R14: ffff9d2c94f424e8 R15: ffff9d2c695de068
[Sat Aug 5 13:46:21 2017] FS: 0000000000000000(0000) GS:ffff9d2cff400000(0000) knlGS:0000000000000000
[Sat Aug 5 13:46:21 2017] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Sat Aug 5 13:46:21 2017] CR2: 000000fd4a1b4b48 CR3: 00000004536d4000 CR4: 00000000003406f0
[Sat Aug 5 13:46:21 2017] Call Trace:
[Sat Aug 5 13:46:21 2017] ? snprintf+0x45/0x70
[Sat Aug 5 13:46:21 2017] request_firmware+0x37/0x50
[Sat Aug 5 13:46:21 2017] btusb_setup_qca+0x22d/0x410 [btusb]
[Sat Aug 5 13:46:21 2017] ? __pm_runtime_resume+0x5b/0x80
[Sat Aug 5 13:46:21 2017] btusb_open+0x45/0x250 [btusb]
[Sat Aug 5 13:46:21 2017] hci_dev_do_open+0x6c/0x590 [bluetooth]
[Sat Aug 5 13:46:21 2017] ? try_to_wake_up+0x59/0x470
[Sat Aug 5 13:46:21 2017] hci_power_on+0x4e/0x200 [bluetooth]
[Sat Aug 5 13:46:21 2017] ? lock_timer_base+0x81/0xa0
[Sat Aug 5 13:46:21 2017] process_one_work+0x193/0x3c0
[Sat Aug 5 13:46:21 2017] worker_thread+0x4a/0x3a0
[Sat Aug 5 13:46:21 2017] kthread+0x125/0x140
[Sat Aug 5 13:46:21 2017] ? process_one_work+0x3c0/0x3c0
[Sat Aug 5 13:46:21 2017] ? kthread_park+0x60/0x60
[Sat Aug 5 13:46:21 2017] ret_from_fork+0x25/0x30
[Sat Aug 5 13:46:21 2017] Code: 08 48 83 fb 28 74 45 48 8b 8b a0 ee aa 93 e9 e6 fe ff ff 48 c7 c7 a0 ad fa 93 e8 4d 71 2f 00 48 c7 c7 88 15 cf 93 e8 42 86 b6 ff <0f> ff 41 b9 90 ff ff ff e9 06 fd ff ff 48 c7 45 a8 ff ff ff 7f
[Sat Aug 5 13:46:21 2017] ---[ end trace ff5be3b6989ab935 ]---