[Bug 1866852] Re: System Display black screen on reboot or after a clean shutdown with USB-C Dock Monitor

[Matthieu Clemenceau]

** Also affects: grub (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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Title:
  System Display black screen on reboot or after a clean shutdown with
  USB-C Dock Monitor

Status in grub package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Invalid

Bug description:
  I'm running focal devel and the latest kernel (see proc version below)

  Linux version 5.4.0-18-generic (buildd at lgw01-amd64-034) (gcc version
  9.2.1 20200306 (Ubuntu 9.2.1-31ubuntu3)) #22-Ubuntu SMP Sat Mar 7
  18:13:06 UTC 2020

  Dock Monitor is supported very well with multiple usb devices plugged
  on the monitor.

  However on reboot I face a black screen with no ability to enter my FDE password.
  Both my Laptop screen and the attached usb-c display nothing
  I have to hard power off and reboot without the USB-C monitor plugged in.

  Otherwise A reboot cycle with the usb-c unplugged works perfectly.

  Also I tried to run ubuntu-bug linux or ubuntu-bug linux-image-generic without success. I would be happy to provide much more debugging information. I will attach then to the launchpad Bug #
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  mclemenceau   2988 F.... pulseaudio
   /dev/snd/controlC0:  mclemenceau   2988 F.... pulseaudio
   /dev/snd/controlC1:  mclemenceau   2988 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-01-05 (64 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: HP HP Spectre x360 Convertible 13-ae0xx
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  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 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-18-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-18-generic N/A
   linux-backports-modules-5.4.0-18-generic  N/A
   linux-firmware                            1.186
  Tags:  focal
  Uname: Linux 5.4.0-18-generic x86_64
  UpgradeStatus: Upgraded to focal on 2020-01-23 (47 days ago)
  UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/14/2018
  dmi.bios.vendor: AMI
  dmi.bios.version: F.21
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 83B9
  dmi.board.vendor: HP
  dmi.board.version: 56.41
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAMI:bvrF.21:bd06/14/2018:svnHP:pnHPSpectrex360Convertible13-ae0xx:pvr:rvnHP:rn83B9:rvr56.41:cvnHP:ct31:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP Spectre
  dmi.product.name: HP Spectre x360 Convertible 13-ae0xx
  dmi.product.sku: 2TV18AS#ABA
  dmi.sys.vendor: HP

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