apport information

** Attachment added: "CurrentDmesg.txt"
   
https://bugs.launchpad.net/bugs/1820811/+attachment/5247512/+files/CurrentDmesg.txt

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https://bugs.launchpad.net/bugs/1820811

Title:
  Thunderbolt3 dock freezes X on hotplug when used with external
  displays

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This bug is very similar to 
https://bugs.launchpad.net/dell-sputnik/+bug/1752165 and has the same steps to 
reproduce, but it's not related to nvidia drivers. I have Lenovo Thinkpad T480s 
connected to a ThinkPad Thunderbolt 3 Dock. I have installed 4.15.0.46, 
4.18.0.16 kernel. Both of these kernels have the issue. I followed this comment 
https://bugs.launchpad.net/dell-sputnik/+bug/1752165/comments/41 and installed 
4.20.6 from UKUU and the issue is gone.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dmisharo   2223 F.... pulseaudio
   /dev/snd/pcmC0D0p:   dmisharo   2223 F...m pulseaudio
   /dev/snd/controlC1:  dmisharo   2223 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: KDE neon 18.04
  HibernationDevice: RESUME=UUID=611a9c7d-fcaa-4717-b1d2-d89edca7e661
  InstallationDate: Installed on 2018-11-25 (114 days ago)
  InstallationMedia: neon user "Bionic" - Build amd64 LIVE Binary 20181122-05:40
  MachineType: LENOVO 20L8S2N80E
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-16-generic 
root=/dev/mapper/neon--vg-root ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-16-generic N/A
   linux-backports-modules-4.18.0-16-generic  N/A
   linux-firmware                             1.173.3
  Tags:  bionic
  Uname: Linux 4.18.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/18/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N22ET48W (1.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20L8S2N80E
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: RH0023049
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN22ET48W(1.25):bd07/18/2018:svnLENOVO:pn20L8S2N80E:pvrThinkPadT480s:rvnLENOVO:rn20L8S2N80E:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T480s
  dmi.product.name: 20L8S2N80E
  dmi.product.sku: LENOVO_MT_20L8_BU_Think_FM_ThinkPad T480s
  dmi.product.version: ThinkPad T480s
  dmi.sys.vendor: LENOVO

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