bluez didn't change in that serie, if the issue is new then it's likely a kernel bug
** Package changed: bluez (Ubuntu) => linux (Ubuntu) -- 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/1830538 Title: Can't get HIDP connection info Status in linux package in Ubuntu: Confirmed Bug description: Hi, I'm trying to use a Teemi TMSL-50 bluetooth barcode scanner (in keyboard emulation mode) with a USB bluetooth dongle in an 18.04 machine, which used to work some months ago. Now I can still pair them, the ubuntu machine sees the devices and lists as paired, but can't connect with human interface device service (HID). /var/log/syslog says May 26 14:44:49 machine1 bluetoothd[1272]: Can't get HIDP connection info May 26 14:44:51 machine1 bluetoothd[1272]: connect error: Invalid exchange (52) Since the scanner and the usb dongle are unchanged, it must be a problem of the ubuntu machine. regards ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: bluez 5.48-0ubuntu3.1 ProcVersionSignature: Ubuntu 4.15.0-50.54-generic 4.15.18 Uname: Linux 4.15.0-50-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.9-0ubuntu7.6 Architecture: amd64 CurrentDesktop: XFCE Date: Sun May 26 14:48:12 2019 InstallationDate: Installed on 2018-06-09 (350 days ago) InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) InterestingModules: rfcomm bnep btusb bluetooth MachineType: Medion G24 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-50-generic root=UUID=a3f06afa-8405-4064-8044-0a9e1b4c19c8 ro quiet splash vt.handoff=1 SourcePackage: bluez UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/12/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: H61TIW08.111 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H61H2-TI2 dmi.board.vendor: Medion dmi.board.version: 1.0 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Medion dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrH61TIW08.111:bd10/12/2012:svnMedion:pnG24:pvr1.0:rvnMedion:rnH61H2-TI2:rvr1.0:cvnMedion:ct3:cvr1.0: dmi.product.family: To be filled by O.E.M. dmi.product.name: G24 dmi.product.version: 1.0 dmi.sys.vendor: Medion hciconfig: hci0: Type: Primary Bus: USB BD Address: 00:1A:7D:DA:71:13 ACL MTU: 310:10 SCO MTU: 64:8 UP RUNNING PSCAN RX bytes:3400 acl:0 sco:0 events:192 errors:0 TX bytes:5012 acl:0 sco:0 commands:142 errors:0 mtime.conffile..etc.dbus-1.system.d.bluetooth.conf: 2019-05-26T14:29:51.468868 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830538/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp