Public bug reported:

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

Linux version 5.4.0-18-generic (buildd@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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: apport-collected champagne focal

** Tags added: champagne

** Tags added: focal

** Tags added: apport-collected

** Description changed:

  I'm running focal devel and the latest kernel (see proc version below)
  
  Linux version 5.4.0-18-generic (buildd@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 #
+ 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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https://bugs.launchpad.net/bugs/1866852

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

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