$ rfkill unblock 3
$ rfkill list
0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
3: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no


but the result is the same. I open the settings panel, go to the Bluetooth tab, 
try to turn it on, the switch shows 'ON', but nothing changes. going away from 
this tab and back will show the switch 'OFF'

is there a command line tool I can turn on & off?

yes, this is the effect on clean boot as well, not just after a reboot

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https://bugs.launchpad.net/bugs/1782893

Title:
  Bluetooth not working on Dell XPS 15

Status in bluez package in Ubuntu:
  Incomplete
Status in gnome-bluetooth package in Ubuntu:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Bluetooth doesn't work on the Dell XPS 15 laptop, with Ubuntu 18.04.

  expected behavior:

  in Settings, one goes to the Bluetooth tab, slides the 'ON' button to
  'ON', and then Bluetooth is enabled, and one can pair devices

  what is happening:

  in Settings, when clicking on the 'ON' button in the Bluetooth tab, it
  seems to turn on, that falls back to off

  some relevant output:

  $ uname -a; lspci -nnk | grep -iA2 net; lsusb; dmesg | grep -i bluetooth; 
dmesg | grep -i firmware; lsmod | grep bluetoothLinux
  Linux dell-xps15 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 18:02:16 UTC 
2018 x86_64 x86_64 x86_64 GNU/Linux
  02:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac Wireless 
Network Adapter [168c:003e] (rev 32)
        Subsystem: Bigfoot Networks, Inc. QCA6174 802.11ac Wireless Network 
Adapter [1a56:1535]
        Kernel driver in use: ath10k_pci
        Kernel modules: ath10k_pci
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 004: ID 138a:0091 Validity Sensors, Inc. 
  Bus 001 Device 003: ID 0cf3:e300 Atheros Communications, Inc. 
  Bus 001 Device 005: ID 0c45:6713 Microdia 
  Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  [    3.905518] Bluetooth: Core ver 2.22
  [    3.905532] Bluetooth: HCI device and connection manager initialized
  [    3.905534] Bluetooth: HCI socket layer initialized
  [    3.905536] Bluetooth: L2CAP socket layer initialized
  [    3.905539] Bluetooth: SCO socket layer initialized
  [    0.028000] Spectre V2 : Enabling Restricted Speculation for firmware calls
  [    0.068684] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
  [    1.460567] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin 
(v1.1)
  [    3.857792] ath10k_pci 0000:02:00.0: Direct firmware load for 
ath10k/pre-cal-pci-0000:02:00.0.bin failed with error -2
  [    3.857799] ath10k_pci 0000:02:00.0: Direct firmware load for 
ath10k/cal-pci-0000:02:00.0.bin failed with error -2
  [    3.860582] ath10k_pci 0000:02:00.0: firmware ver 
WLAN.RM.4.4.1-00079-QCARMSWPZ-1 api 6 features wowlan,ignore-otp crc32 fd869beb
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  am         5501 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=2e64cf71-cb2d-491f-b8cd-fef8c3aeb582
  InstallationDate: Installed on 2017-10-23 (272 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
  MachineType: Dell Inc. XPS 15 9560
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=a991df19-cc0a-4108-b718-c90ef7113f52 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-06-20 (32 days ago)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/23/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.9.4
  dmi.board.name: 05FFDN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.9.4:bd04/23/2018:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9560
  dmi.sys.vendor: Dell Inc.

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