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

[Matthieu Clemenceau]

After removing all devices plugged in one by one,  Issue seems to be
caused by my USB dongle needed for my wireless keyboard and mouse...

I've seen report online see below

https://askubuntu.com/questions/884199/grub-freezes-when-logitech-unifying-receiver-plugged-in
https://h30434.www3.hp.com/t5/Notebook-Operating-System-and-Recovery/Linux-Spectre-x360-13-late-2019-does-not-work-with-Linux/td-p/7316977

Those two reports seem limited to my hardware, could be HP BIOS.

the recommended workaround is to enable Legacy Mode which isn't
acceptable for me since it requires to disable Secure Boot.

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

Status in grub2 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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