Thanks for the bug report. It appears the first gnome-shell instance
(the login screen) has started before the amdgpu kernel driver was
loaded. And when the amdgpu driver appears one second later, gnome-shell
thinks the GPU has been swapped. The compositor (Mutter) clearly does
not handle this well, but it also shouldn't have to. The login screen
should not be started until amdgpu has fully loaded.
The long settling time in this case might be caused by having two AMD
GPUs to initialize.
** Summary changed:
- Ubuntu 25.04 fails to start gnome login shell
+ Login screen starts with simpledrm and switches to amdgpu one second later,
causing freezes
** Package changed: gnome-shell (Ubuntu) => gdm3 (Ubuntu)
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags added: amdgpu hybrid
** Changed in: gdm3 (Ubuntu)
Importance: Undecided => High
** Changed in: systemd (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/2115451
Title:
Login screen starts with simpledrm and switches to amdgpu one second
later, causing freezes
Status in gdm3 package in Ubuntu:
New
Status in systemd package in Ubuntu:
New
Bug description:
After upgrading to Ubuntu 25.04 my laptop fails to properly start the
gnome login shell. During boot I see the graphical splash screen as
expected, but once the login screen should show, one of the below
things happen:
- Nothing, I keep seeing the boot splash screen.
- The login screen is rendered, but only a single frame. Moving the mouse or
pressing keys has no effect.
- The login screen is rendered and the mouse cursor moves, but none of the
widgets respond to clicks or pressing keys.
To recover, I have to Ctrl+Alt+F2 and login on the terminal interface.
Then I can do a `sudo systemctl restart user-120.slice` after which I
can go back to the GUI login screen and it works.
ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: gnome-shell 48.0-1ubuntu1
ProcVersionSignature: Ubuntu 6.14.0-22.22-generic 6.14.5
Uname: Linux 6.14.0-22-generic x86_64
ApportVersion: 2.32.0-0ubuntu5.2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 26 22:21:40 2025
DisplayManager: gdm3
InstallationDate: Installed on 2024-12-25 (183 days ago)
InstallationMedia: Ubuntu 24.10 "Oracular Oriole" - Release amd64 (20241009.4)
RelatedPackageVersions: mutter-common 48.1-1ubuntu3
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to plucky on 2025-06-15 (11 days ago)
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