The only thing I can think that is wrong is the configuration file of the kernels. They have some significant differences regarding Bluetooth.
** Attachment added: "diff_415_416rc2+.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1757218/+attachment/5092727/+files/diff_415_416rc2+.txt -- 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/1757218 Title: QCA9377 isn't being recognized sometimes Status in linux package in Ubuntu: Confirmed Bug description: Sometimes, the Wireless Network Card QCA9377 is not recognized on boot. This caused, on prior versions, a kernel panic at boot. With Bionic, the system boots but is unable to use wireless network. On dmesg there are messages like: [ 2.680590] usb 1-7: new full-speed USB device number 7 using xhci_hcd [ 2.808640] usb 1-7: device descriptor read/64, error -71 [ 3.044337] usb 1-7: device descriptor read/64, error -71 [ 3.280064] usb 1-7: new full-speed USB device number 8 using xhci_hcd [ 3.408245] usb 1-7: device descriptor read/64, error -71 [ 3.644244] usb 1-7: device descriptor read/64, error -71 [ 3.752193] usb usb1-port7: attempt power cycle [ 4.404591] usb 1-7: new full-speed USB device number 9 using xhci_hcd [ 4.404904] usb 1-7: Device not responding to setup address. [ 4.612478] usb 1-7: Device not responding to setup address. [ 4.820588] usb 1-7: device not accepting address 9, error -71 [ 4.948591] usb 1-7: new full-speed USB device number 10 using xhci_hcd [ 4.949109] usb 1-7: Device not responding to setup address. [ 5.156893] usb 1-7: Device not responding to setup address. [ 5.364589] usb 1-7: device not accepting address 10, error -71 [ 5.364655] usb usb1-port7: unable to enumerate USB device And lspci and lsusb don't show the wireless network card. The alternative is to turn the system off. Reboot don't work and reboot to Windows 10 also don't. The system must be powered off to restore functionality. Then, on the next boot, it works properly. However, after the system is turned off, it may cause the issue again. This is not 100% consistent, but mostly it cycles between powering off and powering on the notebook as: Work -> Don't work -> Work -> Don't work On Windows 10 this doesn't happen but when happens on Ubuntu, it's possible to reboot and see the status on Windows 10 too: on Device Manager it's shown a unidentified USB device at 1-7. Sometimes, on Windows 10's Network Devices it's shown, instead of the QCA9377, from four to six different devices with generic names and Bluetooth and/or Wireless don't work. When turning Ubuntu off, there are messages that appears a few instants before the system is turned off: Mar 18 18:27:26 usuario-Lenovo-ideapad-310-14ISK kernel: [14146.403388] ath10k_pci 0000:02:00.0: failed to install key for vdev 0 peer xx:xx:xx:xx:xx:xx: -110 Mar 18 18:27:26 usuario-Lenovo-ideapad-310-14ISK kernel: [14146.403399] wlp2s0: failed to remove key (0, xx:xx:xx:xx:xx:xx) from hardware (-110) Generally, only the second message appears (but both are recorded on kern.log). The MAC adress is the one from the router, not from the wireless card. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-12-generic 4.15.0-12.13 ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7 Uname: Linux 4.15.0-12-generic x86_64 ApportVersion: 2.20.8-0ubuntu10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: usuario 1364 F.... pulseaudio /dev/snd/seq: usuario 1258 F.... timidity CurrentDesktop: XFCE Date: Tue Mar 20 14:43:42 2018 HibernationDevice: RESUME=UUID=9f36068f-c6d6-4fd6-87d5-46f1f5247563 InstallationDate: Installed on 2017-06-13 (279 days ago) InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: LENOVO 80UG ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-12-generic.efi.signed root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet RelatedPackageVersions: linux-restricted-modules-4.15.0-12-generic N/A linux-backports-modules-4.15.0-12-generic N/A linux-firmware 1.173 SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2017-10-20 (151 days ago) dmi.bios.date: 07/10/2017 dmi.bios.vendor: LENOVO dmi.bios.version: 0XCN43WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: Toronto 4A2 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40679 WIN dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo ideapad 310-14ISK dmi.modalias: dmi:bvnLENOVO:bvr0XCN43WW:bd07/10/2017:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK: dmi.product.family: IDEAPAD dmi.product.name: 80UG dmi.product.version: Lenovo ideapad 310-14ISK dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1757218/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp