I am now running Ubuntu 20.04 with kernel version 5.4.0-37-generic and have reproduced the bug after running the command # echo "file drivers/pci/* +p" > /sys/kernel/debug/dynamic_debug/control as was requested. Attached is the dmesg log.
Attached to the Thunderbolt hub are an iphone and an external monitor. The connection drops a couple times over the period of the log. ** Attachment added: "dmesg" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853061/+attachment/5384224/+files/dmesg -- 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/1853061 Title: Connection to USB-C hub frequently drops when charging over it Status in linux package in Ubuntu: Confirmed Bug description: I am running Ubuntu 19.10 on a Lenovo Thinkpad X1 Extreme. I have a CalDigit TS3 Plus USB-C hub connected to one of the laptop's USB-C/Thunderbolt ports. The laptop supports charging over USB-C. When I try to charge from the hub over USB-C, Ubuntu seems to frequently "drop" the connection to the hub and loses connection to the stuff attached to the hub (e.g., an external monitor connected to the hub by USB-C to displayport, an ethernet connection, and USB devices). After a few seconds, the computer reconnects to these devices. I disabled TLP but the problem persists. When I have the laptop's power adapter attached in addition to the USB-C hub, the problem does not appear and the computer does not lose connection to the peripherals. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-23-generic 5.3.0-23.25 ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7 Uname: Linux 5.3.0-23-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: matt 2211 F.... pulseaudio /dev/snd/controlC1: matt 2211 F.... pulseaudio /dev/snd/controlC0: matt 2211 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Mon Nov 18 13:44:33 2019 InstallationDate: Installed on 2019-09-04 (75 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) MachineType: LENOVO 20MGS1YW00 ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-23-generic root=UUID=3a5c73f9-5be3-4590-88a9-e362d949931c ro quiet splash resume=UUID=d464672d-224c-4149-a105-3a0cad515692 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.3.0-23-generic N/A linux-backports-modules-5.3.0-23-generic N/A linux-firmware 1.183.2 SourcePackage: linux UpgradeStatus: Upgraded to eoan on 2019-10-21 (28 days ago) dmi.bios.date: 08/06/2019 dmi.bios.vendor: LENOVO dmi.bios.version: N2EET42W (1.24 ) dmi.board.asset.tag: Not Available dmi.board.name: 20MGS1YW00 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN2EET42W(1.24):bd08/06/2019:svnLENOVO:pn20MGS1YW00:pvrThinkPadX1Extreme:rvnLENOVO:rn20MGS1YW00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad X1 Extreme dmi.product.name: 20MGS1YW00 dmi.product.sku: LENOVO_MT_20MG_BU_Think_FM_ThinkPad X1 Extreme dmi.product.version: ThinkPad X1 Extreme dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853061/+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
