Using the kernel from comment 10, I did not observe an improvement: the devices connected to the hub aren't detected as often as before, requiring the same workaround.
** Attachment added: "Two dmesg with the test kernel" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1904953/+attachment/5437638/+files/dmesg-510056-usbhub.zip -- 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/1904953 Title: USB2.0 HUB only works after an USB device is connected Status in linux package in Ubuntu: Incomplete Bug description: The USB hub identified as: "214b:7000 USB2.0 HUB" presents a problem on Linux where often it is only detected after another device (for example a mouse) is connected to it. On the computer's firmware screen and configuration, and on Windows, the hub works fine: once connected, it is detected and devices connected on it are detected. On Linux, most of the times nothing happens or only the hub is detected (not the devices connected to it). After one of the devices is disconnected and reconnected, or another USB device is connected in the hub, then the hub and all devices connected to it are detected at once. I believe this is a problem related to the Linux kernel because I never observed this behaviour on the computer's firmware or on Windows. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-53-generic 5.4.0-53.59 ProcVersionSignature: Ubuntu 5.4.0-53.59-generic 5.4.65 Uname: Linux 5.4.0-53-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu27.12 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: XFCE Date: Thu Nov 19 23:54:44 2020 HibernationDevice: RESUME=UUID=a82e38a0-8d20-49dd-9cbd-de7216b589fc InstallationDate: Installed on 2017-06-13 (1255 days ago) InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: LENOVO 80UG ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-53-generic root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro ro kvm.ignore_msrs=1 kvm.report_ignored_msrs=0 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0 i915.enable_gvt=1 resume=UUID=a82e38a0-8d20-49dd-9cbd-de7216b589fc log_buf_len=1M usbhid.quirks=0x0079:0x0006:0x100000 nbd.nbds_max=2 nbd.max_part=127 RelatedPackageVersions: linux-restricted-modules-5.4.0-53-generic N/A linux-backports-modules-5.4.0-53-generic N/A linux-firmware 1.187.4 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2019-12-22 (333 days ago) dmi.bios.date: 08/09/2018 dmi.bios.vendor: LENOVO dmi.bios.version: 0XCN45WW 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:bvr0XCN45WW:bd08/09/2018:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK: dmi.product.family: IDEAPAD dmi.product.name: 80UG dmi.product.sku: LENOVO_MT_80UG_BU_idea_FM_Lenovo ideapad 310-14ISK 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/1904953/+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
