Ubuntu: Bluetooth stopped working suddenly on Dell XPS 13 9360 Ubuntu 16.04 LTS



Question:

I had connected my bluetooth headphones to my laptop when laptop went to sleep due to no activity. When I turned it back on, bluetooth was not working. i.e. there was no bluetooth icon on the menu bar, bluetooth manager blueman was greyed out, and gave a pop-up error "adapter not found".

I have tried reinstalling blueman, pulseaudio, latest linux kernel, firmware etc. but none of these solutions seem to be able to get bluetooth working again.

Bluetooth does not show up in rfkill list all

0: phy0: Wireless LAN      Soft blocked: no      Hard blocked: no  

sudo lshw -C network output:

  *-network                        description: Wireless interface         product: QCA6174 802.11ac Wireless Network Adapter         vendor: Qualcomm Atheros         physical id: 0         bus info: pci@0000:3a:00.0         logical name: wlp58s0         version: 32         serial: 9c:b6:d0:f1:43:cd         width: 64 bits         clock: 33MHz         capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless         configuration: broadcast=yes driver=ath10k_pci driverversion=4.15.0-041500rc6-lowlatency firmware=WLAN.RM.4.4.1-00051-QCARMSWP-1 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11         resources: irq:135 memory:dc000000-dc1fffff  

lspci output:

00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)  00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)  00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 02)  00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)  00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)  00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)  00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller (rev 21)  00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI (rev 21)  00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)  00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)  00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)  00:1d.0 PCI bridge: Intel Corporation Device 9d18 (rev f1)  00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)  00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)  00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)  00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)  3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)  3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)  3c:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 0116  

uname -a output:

Linux Barad-dur 4.15.0-041500rc6-lowlatency #201712312330 SMP PREEMPT Sun Dec 31 23:33:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux  

lsmod | grep bluetooth; dmesg | egrep -i 'blue|firm' output:

bluetooth             544768  13 btrtl,btintel,bnep,btbcm,btusb  ecdh_generic           24576  1 bluetooth  [    0.073891] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored  [    0.922677] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)  [    3.244634] Bluetooth: Core ver 2.22  [    3.244888] Bluetooth: HCI device and connection manager initialized  [    3.244892] Bluetooth: HCI socket layer initialized  [    3.244894] Bluetooth: L2CAP socket layer initialized  [    3.244899] Bluetooth: SCO socket layer initialized  [    4.584150] Bluetooth: BNEP (Ethernet Emulation) ver 1.3  [    4.584151] Bluetooth: BNEP filters: protocol multicast  [    4.584155] Bluetooth: BNEP socket layer initialized  [    7.352205] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2  [    7.576028] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:3a:00.0.bin failed with error -2  [    7.576034] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/cal-pci-0000:3a:00.0.bin failed with error -2  [    7.578921] ath10k_pci 0000:3a:00.0: firmware ver WLAN.RM.4.4.1-00051-QCARMSWP-1 api 6 features wowlan,ignore-otp crc32 c3fd4411  

I would appreciate any help possible to get bluetooth working normally.

EDIT:

Just as it randomly stopped working, it has now randomly started working again and I have no idea why. But I guess, so long as it is working, I won't complain.


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