Unencryption screen doesn't allow input after additional displays

[Jari Hyle]

I'm not sure what package handles it as my researching skills are lacking.

I have Ubuntu 19.10 installed with full drive encryption and when I boot up my laptop it asks for the unencryption key. If I power on my additional displays during that screen the keyboard doesn't input anything to the unencryption key field anymore. The keyboard works otherwise and I can ctrl+alt+del to reboot. Works normally if the displays are on from the start and not powered on during the unencryption screen.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gdm3 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 14 10:18:21 2019
InstallationDate: Installed on 2018-10-08 (401 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: gdm3
UpgradeStatus: Upgraded to eoan on 2019-10-23 (22 days ago)

[Sebastien Bacher (seb128)]

Thank you for your bug report.
Could you give some details on your setup. What videocard do you use? How is the extra screen connected?
Could you add a 'journalctl -b 0' log from a boot where you triggered the issue?

[Jari Hyle (rulqu)]

I use ThinkPad T480 and I'm not sure if this particular instance uses the Intel Corporation UHD Graphics 620 or GeForce MX150. The laptop is connected to a Docking station. Docking station is "hinkPad Ultra Docking Station" type 40AJ(or 4OAJ).

As this bug happens before I can get the drive unencrypted, is anything written to logs?

[Sebastien Bacher (seb128)]

Good question, I'm unsure how it's handled but it's possible that it keeps the log in memory until the disk is available to write the content

[Jari Hyle (rulqu)]

Here's the output of journalctl -b -0

One thing to note though is that I found a workaround. When the screen freezes I can used shift+tab to enter somekind of console and then shift+tab back to the splash screen. Then it recognizes the additional displays and I can enter the unlock code to the input bar again.