** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1881390
Title:
amdgpu.dc=0 required for gui display
Status in linux package in Ubuntu:
Fix Released
Bug description:
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)
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2020-05-29 (11 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64
(20190805)
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
Tags: bionic
Uname: Linux 5.7.1-050701-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
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