You have been subscribed to a public bug:
Black screen after grub menu, selected kernel 5.4.0-29-generic and can't
login, have to shut down laptop by pressing power button, or Alt + SysRq
+ REISUB(O), and when those dont work a hard power off.
I have installed linux-signed-oem-5.6 and ppa.launchpad.net/oibaf
/graphics-drivers/ubuntu as a workaround the this problem
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue May 5 01:25:40 2020
InstallationDate: Installed on 2020-05-03 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2020-05-04T14:16:57.900775
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: amd64 amdgpu apport-bug focal third-party-packages wayland-session
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[amdgpu] black screen before login on 5.4 kernel, but iommu=soft fixes it
https://bugs.launchpad.net/bugs/1876835
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