** 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)
  --- 
  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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