Public bug reported:
I have a desktop pc with AMD Ryzen 7 9800X3D cpu, Micro-Star
International Co., Ltd. MS-7E59 motherboard and no graphic card other
than the integrated chip in cpu. I have ubuntu 24.04 installed on the
machine and when I turn on the computer and login screen comes up, there
are green horizontal lines across the screen to the point where the text
on the screen is not readable. When I manage to login and OS fully
starts up, these lines do not show anymore and system behaves fine
otherwise. Only place where these green horizontal lines show up are on
login screen.
I have one HDMI port on my motherboard and when I connect monitor
through the HDMI, the issue does not occur. My setup uses two screens,
currently both connected through 10Gbps USB-C to USB-C cables.
xrandr.txt file shows the refresh rate is 29.94Hz which may be the
issue
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gdm3 46.2-1ubuntu1~24.04.7
ProcVersionSignature: Ubuntu 6.17.0-22.22~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-22-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 26 19:15:56 2026
InstallationDate: Installed on 2026-01-26 (90 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.Init.Default: 2026-04-26T18:45:55.681416
mtime.conffile..etc.gdm3.custom.conf: 2026-04-26T19:15:53.425337
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2150386
Title:
Green lines flickering on login screen
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