Public bug reported: Dell laptops have an option for power management in the BIOS setting to control WLAN radio. If enabled, it will sense the connection of the system to a wired network and subsequently disable the selected wireless radios (WLAN and/or WWAN). Upon disconnection from the wired network, the selected wireless radios will be re-enabled.
When Dell docking station (the ethernet is Realtek r8153 USB controller), with runtime PM enabled, is the wired network, WLAN radio won't be re-enabled after unplugging ethernet cable. By checking rfkill, the radio is hard blocked. Disable runtime PM of the r8153 USB device can work around this issue. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: u 2160 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1-highsparrow+X32 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2020-01-10 (54 days ago) InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20190418-12:10 MachineType: Dell Inc. Latitude 9510 Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-1040-oem-osp1 root=UUID=d12aa9db-fdec-46cc-aefd-77a0c7e61db2 ro thunderbolt.dyndbg=+p quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 5.0.0-1040.45-oem-osp1 5.0.21 RelatedPackageVersions: linux-restricted-modules-5.0.0-1040-oem-osp1 N/A linux-backports-modules-5.0.0-1040-oem-osp1 N/A linux-firmware 1.173.14 Tags: bionic Uname: Linux 5.0.0-1040-oem-osp1 x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 12/24/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 0.2.6 dmi.board.vendor: Dell Inc. dmi.chassis.type: 31 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr0.2.6:bd12/24/2019:svnDellInc.:pnLatitude9510:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct31:cvr: dmi.product.family: Latitude dmi.product.name: Latitude 9510 dmi.product.sku: 0983 dmi.sys.vendor: Dell Inc. ** Affects: oem-priority Importance: Undecided Assignee: Che Cheng (cktenn) Status: New ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: apport-collected bionic ihv-realtek ** Attachment added: "Ubuntu 18.04 + Docking + WLAN Radio Issue.mp4" https://bugs.launchpad.net/bugs/1866156/+attachment/5333692/+files/Ubuntu%2018.04%20+%20Docking%20+%20WLAN%20Radio%20Issue.mp4 ** Also affects: oem-priority Importance: Undecided Status: New ** Changed in: oem-priority Assignee: (unassigned) => Che Cheng (cktenn) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1866156 Title: Wireless LAN RF is hardware blocked forever after r8153 ethernet connected. To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1866156/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
