I would like to see a stack trace of the busy bluetoothd process, which means killing it in a way that it will dump core and create a crash report. But that won't work right now because of bug 1870060.
Intead, please attach 'gdb' (run it as root) to the busy bluetoothd process and then run 'bt' in gdb to get a backtrace. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1871695 Title: Bluetoothd uses 100% of a CPU thread Status in bluez package in Ubuntu: Incomplete Bug description: Hi, I have a bluetooth keyboard that I use for my laptop, which runs Kubuntu 19.04. I noticed though, that a short while after connecting the keyboard, the CPU fan goes on and one of the threads is at 100%. If I open a terminal and type "top", it shows that a process called bluetoothd is taking 12% of the CPU power which is a full thread (100/8=12.5). I'm not sure what it's doing, but it doesn't require that much CPU power to work. If I end the process and restart it, the keyboard works fine and the CPU is calm until it happens again (about 20 minutes later). I reinstalled bluez and even tried recompiling from source, but the problem persists. My specs: Version of bluetoothd: 5.50 Linux Kernel: 5.3.0-46-generic KDE Plasma Version 5.16.5 Thank you, Isaac Cohen --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu8.8 Architecture: amd64 CurrentDesktop: KDE DistroRelease: Ubuntu 19.10 InstallationDate: Installed on 2019-12-15 (115 days ago) InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) InterestingModules: rfcomm bnep btusb bluetooth Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0c45:671e Microdia Integrated_Webcam_HD Bus 001 Device 002: ID 27c6:5301 HTMicroelectronics Goodix Fingerprint Device Bus 001 Device 004: ID 0cf3:e009 Qualcomm Atheros Communications Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Inspiron 3583 Package: bluez 5.50-0ubuntu5.1 [modified: lib/systemd/system/bluetooth.service lib/udev/hid2hci lib/udev/rules.d/97-hid2hci.rules] PackageArchitecture: amd64 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-46-generic root=UUID=dad855bd-aa2f-4675-a8a6-6fa960525f41 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18 Tags: eoan Uname: Linux 5.3.0-46-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/30/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.5.1 dmi.board.name: 0WHCP7 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.5.1:bd05/30/2019:svnDellInc.:pnInspiron3583:pvr:rvnDellInc.:rn0WHCP7:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: Inspiron dmi.product.name: Inspiron 3583 dmi.product.sku: 08CA dmi.sys.vendor: Dell Inc. hciconfig: hci0: Type: Primary Bus: USB BD Address: AC:D5:64:CC:54:D6 ACL MTU: 1024:8 SCO MTU: 50:8 UP RUNNING PSCAN ISCAN RX bytes:47194 acl:2390 sco:0 events:266 errors:0 TX bytes:3046 acl:50 sco:0 commands:163 errors:0 mtime.conffile..etc.dbus-1.system.d.bluetooth.conf: 2020-04-07T16:35:14.446062 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1871695/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
