Public bug reported:
I have Ubuntu 18.04 on my system. When I boot, I get a black screen
once mode switching happens. Rescue mode (aka nomodeswitch) would bring
me to a gui screen correctly.
I tried backing off to X.org from Wayland, but that didn't help. I
eventually found an obscure post suggesting adding amdgpu.dc=0 to the
command line. With this added, I have the GUI I expect.
Originally the system worked as expected, but something changed which
required this setting.
The graphics card is an AMD RX480.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-generic-hwe-18.04 5.3.0.53.110
ProcVersionSignature: Ubuntu 5.3.0-53.47~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-53-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat May 30 02:26:41 2020
InstallationDate: Installed on 2020-05-29 (0 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-meta-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-meta-hwe (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1881390
Title:
amdgpu.dc=0 required for gui display
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