Public bug reported: Problem description ------------------- When I disconnect my Dell Latitude 5501 laptop from its Dell WD19 docking station, the screens layout doesn't switch back to single-screen, and the system either:
* freezes immediately (desktop background still displayed, but no mouse, no keyboard) * doesn't freeze. In that case, if I open a terminal and sudo poweroff, the screen turns black, then the system freezes. In both cases, the only recovery method consists in a hard reset. Hardware setup description -------------------------- Laptop is connected to docking station via thunderbolt port. The WD19 docking station is connected to 2 external screens via display ports + USB3 cables (to connect to the embedded USB3 ports on the screens). One of the screens is connected to a keyboard and a mouse via USB. Technical info -------------- See attached file kern.log for a disconnect (see at Mar 23 15:35:56). The problem does not happen on older kernel 4.15.0-1073-oem, so it looks like a regression introduced between 4.15.0-1074-oem and 4.15.0-1076-oem. Laptop BIOS version is up-to-date (v1.6.1). ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-1076-oem 4.15.0-1076.86 ProcVersionSignature: Ubuntu 4.15.0-1076.86-oem 4.15.18 Uname: Linux 4.15.0-1076-oem x86_64 ApportVersion: 2.20.9-0ubuntu7.12 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gvindry 2492 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Mon Mar 23 15:42:42 2020 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-bionic-amd64-20180608-47+brookhollow+X77 InstallationDate: Installed on 2019-12-28 (86 days ago) InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38 MachineType: Dell Inc. Latitude 5501 ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1076-oem root=UUID=d829dfff-8fb3-46f6-8175-92de7a872776 ro mem_sleep_default=deep quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.15.0-1076-oem N/A linux-backports-modules-4.15.0-1076-oem N/A linux-firmware 1.173.16 SourcePackage: linux-oem UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 11/14/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.6.1 dmi.board.name: 0Y8H01 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.6.1:bd11/14/2019:svnDellInc.:pnLatitude5501:pvr:rvnDellInc.:rn0Y8H01:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: Latitude dmi.product.name: Latitude 5501 dmi.sys.vendor: Dell Inc. ** Affects: linux-oem (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic ** Attachment added: "Relevant kern.log (see Mar 23 15:35:56)" https://bugs.launchpad.net/bugs/1868581/+attachment/5340593/+files/kern.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1868581 Title: [DELL][BIONIC] Freeze after docking station disconnect To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-oem/+bug/1868581/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
