Please take a look at this answer at AskUbuntu: https://askubuntu.com/a/1029749/95109
Using the newest driver files of the Windows driver and putting (overwriting) them into the /lib/firmware/qca directory seems to help. I'm using this for some days now and had no problems since then. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1766825 Title: Bluetooth issues with Dell XPS 13 (9370) Status in Dell Sputnik: Confirmed Status in linux package in Ubuntu: Confirmed Bug description: I have the following problem with my Bluetooth module on my new Dell XPS 13 (9370) with Ubuntu preinstalled. The bluetooth module gets disabled for some reason. The bluetooth devices (keyboard and mouse) just stop working in the middle of the work, the Bluetooth indicator goes away and the module is also gone in the rfkill list. To get it back working I need to reboot the machine, start the BIOS, disable the Bluetooth module and re-enable it or I have to turn the machine completely off and on again. After that, the bluetooth module is available again. That's pretty annoying. My syslog when this happens: Apr 11 12:25:45 visyu-albatross kernel: [ 2513.913725] usb 1-7: USB disconnect, device number 3 Apr 11 12:25:45 visyu-albatross acpid: input device has been disconnected, fd 22 Apr 11 12:25:46 visyu-albatross systemd[1]: Starting Load/Save RF Kill Switch Status... Apr 11 12:25:46 visyu-albatross systemd[1]: Started Load/Save RF Kill Switch Status. Apr 11 12:25:46 visyu-albatross systemd[1]: Created slice User Slice of root. Apr 11 12:25:46 visyu-albatross systemd[1]: Starting User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[1]: Started Session c9 of user root. Apr 11 12:25:46 visyu-albatross acpid: input device has been disconnected, fd 21 Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Timers. Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Sockets. Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Paths. Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Default. Apr 11 12:25:46 visyu-albatross systemd[12109]: Startup finished in 15ms. Apr 11 12:25:46 visyu-albatross systemd[1]: Started User Manager for UID 0. Apr 11 12:25:46 visyu-albatross bluetoothd[1062]: Endpoint unregistered: sender=:1.80 path=/MediaEndpoint/A2DPSource Apr 11 12:25:46 visyu-albatross bluetoothd[1062]: Endpoint unregistered: sender=:1.80 path=/MediaEndpoint/A2DPSink Apr 11 12:25:46 visyu-albatross systemd[1]: Stopping User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[12109]: Stopped target Default. Apr 11 12:25:46 visyu-albatross systemd[12109]: Stopped target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12109]: Stopped target Sockets. Apr 11 12:25:46 visyu-albatross systemd[12109]: Reached target Shutdown. Apr 11 12:25:46 visyu-albatross systemd[12109]: Stopped target Paths. Apr 11 12:25:46 visyu-albatross systemd[1]: Created slice User Slice of root. Apr 11 12:25:46 visyu-albatross systemd[12109]: Starting Exit the Session... Apr 11 12:25:46 visyu-albatross systemd[12109]: Stopped target Timers. Apr 11 12:25:46 visyu-albatross systemd[1]: Started Session c10 of user root. Apr 11 12:25:46 visyu-albatross systemd[12109]: Received SIGRTMIN+24 from PID 12120 (kill). Apr 11 12:25:46 visyu-albatross systemd[1]: Starting User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Timers. Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Sockets. Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Paths. Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Default. Apr 11 12:25:46 visyu-albatross systemd[12123]: Startup finished in 14ms. Apr 11 12:25:46 visyu-albatross systemd[1]: Started User Manager for UID 0. Apr 11 12:25:46 visyu-albatross systemd[1]: Stopping User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[12123]: Reached target Shutdown. Apr 11 12:25:46 visyu-albatross systemd[12123]: Starting Exit the Session... Apr 11 12:25:46 visyu-albatross systemd[12123]: Stopped target Default. Apr 11 12:25:46 visyu-albatross systemd[12123]: Stopped target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12123]: Stopped target Timers. Apr 11 12:25:46 visyu-albatross systemd[12123]: Stopped target Paths. Apr 11 12:25:46 visyu-albatross systemd[12123]: Stopped target Sockets. Apr 11 12:25:46 visyu-albatross systemd[12123]: Received SIGRTMIN+24 from PID 12133 (kill). Apr 11 12:25:46 visyu-albatross systemd[1]: Created slice User Slice of root. Apr 11 12:25:46 visyu-albatross systemd[1]: Started Session c11 of user root. Apr 11 12:25:46 visyu-albatross systemd[1]: Starting User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Sockets. Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Paths. Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Timers. Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Default. Apr 11 12:25:46 visyu-albatross systemd[12140]: Startup finished in 15ms. Apr 11 12:25:46 visyu-albatross systemd[1]: Started User Manager for UID 0. Apr 11 12:25:46 visyu-albatross systemd[1]: Stopping User Manager for UID 0... Apr 11 12:25:46 visyu-albatross systemd[12140]: Reached target Shutdown. Apr 11 12:25:46 visyu-albatross systemd[12140]: Starting Exit the Session... Apr 11 12:25:46 visyu-albatross systemd[12140]: Stopped target Default. Apr 11 12:25:46 visyu-albatross systemd[12140]: Stopped target Basic System. Apr 11 12:25:46 visyu-albatross systemd[12140]: Stopped target Paths. Apr 11 12:25:46 visyu-albatross systemd[12140]: Stopped target Timers. Apr 11 12:25:46 visyu-albatross systemd[12140]: Stopped target Sockets. Apr 11 12:25:46 visyu-albatross systemd[1]: Created slice User Slice of root. Apr 11 12:25:46 visyu-albatross systemd[1]: user@0.service: Start request repeated too quickly. Apr 11 12:25:46 visyu-albatross systemd[1]: Failed to start User Manager for UID 0. Apr 11 12:25:46 visyu-albatross systemd[12140]: Received SIGRTMIN+24 from PID 12148 (kill). Apr 11 12:25:46 visyu-albatross systemd[1]: Started Session c12 of user root. Apr 11 12:25:46 visyu-albatross systemd[1]: Stopped User Manager for UID 0. Apr 11 12:25:46 visyu-albatross systemd[1]: Removed slice User Slice of root. Apr 11 12:25:47 visyu-albatross systemd[1]: Created slice User Slice of root. Apr 11 12:25:47 visyu-albatross systemd[1]: Starting User Manager for UID 0... Apr 11 12:25:47 visyu-albatross systemd[1]: Started Session c13 of user root. Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Timers. Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Sockets. Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Paths. Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Basic System. Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Default. Apr 11 12:25:47 visyu-albatross systemd[12167]: Startup finished in 17ms. Apr 11 12:25:47 visyu-albatross systemd[1]: Started User Manager for UID 0. Apr 11 12:25:47 visyu-albatross systemd[1]: bluetooth.target: Unit not needed anymore. Stopping. Apr 11 12:25:47 visyu-albatross systemd[1]: Stopped target Bluetooth. Apr 11 12:25:47 visyu-albatross systemd[1]: Stopping User Manager for UID 0... Apr 11 12:25:47 visyu-albatross systemd[12167]: Reached target Shutdown. Apr 11 12:25:47 visyu-albatross systemd[12167]: Stopped target Default. Apr 11 12:25:47 visyu-albatross systemd[12167]: Stopped target Basic System. Apr 11 12:25:47 visyu-albatross systemd[12167]: Stopped target Timers. Apr 11 12:25:47 visyu-albatross systemd[12167]: Stopped target Paths. Apr 11 12:25:47 visyu-albatross systemd[12167]: Stopped target Sockets. Apr 11 12:25:47 visyu-albatross systemd[12167]: Starting Exit the Session... Apr 11 12:25:47 visyu-albatross systemd[12167]: Received SIGRTMIN+24 from PID 12184 (kill). Apr 11 12:25:47 visyu-albatross systemd[1]: Stopped User Manager for UID 0. Apr 11 12:25:47 visyu-albatross systemd[1]: Removed slice User Slice of root. Apr 11 12:25:48 visyu-albatross org.gnome.Terminal[2417]: ** (gnome-terminal-server:12197): WARNING **: Unable to set locale modifiers with XSetLocaleModifiers() As far as I can see, it's the following hardware: QCA 6174 Killer Qualcomm / QCA 1535 Killer Qualcomm Mostly I have these two bluetooth devices paired and connected: - Logitech K810 keyboard - Logitech MX Anywhere2 mouse It's the default Ubuntu software configuration by Dell. Ubuntu 16.04, Kernel 4.4.0-121 If you need more information, please let me know. --- ApportVersion: 2.20.1-0ubuntu2.16 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: thunder 9273 F.... pulseaudio CurrentDesktop: Unity DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-xenial-amd64-20160624-2 DistroRelease: Ubuntu 16.04 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=8a49f47a-af59-4a45-9e33-fac6a66b8f97 InstallationDate: Installed on 2018-03-26 (29 days ago) InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47 MachineType: Dell Inc. XPS 13 9370 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-121-generic.efi.signed root=UUID=7c1e0890-7496-43db-b9d3-4cc7e38808d3 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-121.145-generic 4.4.117 RelatedPackageVersions: linux-restricted-modules-4.4.0-121-generic N/A linux-backports-modules-4.4.0-121-generic N/A linux-firmware 1.173 Tags: xenial Uname: Linux 4.4.0-121-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev rslsync sambashare sudo vboxusers _MarkForUpload: True dmi.bios.date: 02/21/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.2.1 dmi.board.name: 0F6P3V dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.2.1:bd02/21/2018:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9370 dmi.sys.vendor: Dell Inc. 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