This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1881390 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1881390 Title: amdgpu.dc=0 required for gui display Status in linux package in Ubuntu: Incomplete 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881390/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp