I did a significant amount of testing on this over the last week or so (and a few hours tonight), as there are two nearly-identical issues that have been reported; one running 24.04 under Hyper-V, and accessing it via RDP, resulting in a black/blank screen after a number of idle minutes, and another using a 24.04 VM on ESXi, where the VMRC/console will go blank/gray, and never return.
While these machines are inaccessible via their graphical consoles, they can be used via SSH and other means, just not graphically. The Hyper-V/RDP issue is almost entirely mitigated by _disabling_ the Screen Blank under Settings -> Power, and I'm confident that this either solves it, or works around it. I personally tested setting that blank value to 5 minutes, 10 minutes, etc. and confirmed the blank/black screen follows 1 minute _after_ the screen is blanked. That is, attaching at 4-5 minutes works when it's set to 5 minutes, but attaching at 6 minutes does not. When moving that to 10 minutes, attaching at 4, 5, 6 minutes works, but 11 minutes does not, and so on. The VMware issue is subtly different. I tested the same screen blank setting (set to 'Never'), which stops the console from being lost/blanked, but I don't believe this is the root cause. I also tried setting 'org.gnome.settings-daemon.plugins.power idle-dim false', in an attempt to chase down the same line of reasoning, which did _not_ resolve the issue (after restoring the Screen Blanking back to the default 5 minutes). However, setting 'MUTTER_DEBUG_FORCE_KMS_MODE=simple' _does_ positively influence the issue, although with this set, the screen _never_ blanks, even when Settings -> Power is set to blank the screen at 5 minutes. I'm not clear why that isn't blanking, but I'll chase that down next. So this looks to be mutter-related, or at the very least, gnome-shell, but I don't yet have a definitive smoking gun. It's absolutely related to screen blanking, that much is clear, and all of my tests confirm that. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/2089709 Title: Ubuntu 24.04 sometimes logs in to a black screen if the mouse is moved during login Status in mutter package in Ubuntu: Fix Released Status in mutter source package in Noble: Confirmed Status in mutter source package in Oracular: New Status in mutter source package in Plucky: Fix Released Status in mutter source package in Questing: Fix Released Bug description: I recently upgraded from Ubuntu 22.04 to Ubuntu 24.04. Now whenever I log in, sometimes I'll get a blank screen. It will only show the mouse cursor as an X. The problem seems to be intermittent. So far it's only happened to me using X11. My current workaround: 1. Open another terminal (e.g. Ctrl+Alt+F6) 2. Restart gdm3 (sudo systemctl restart gdm3) This seems to be affecting many people, although I couldn't find an existing bug: https://askubuntu.com/questions/1514757/issue-with- ubuntu-24-04-black-screen-with-cursor-on-login $ lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.1 LTS Release: 24.04 $ apt-cache policy gdm3 gdm3: Installed: 46.0-2ubuntu1 Candidate: 46.0-2ubuntu1 Version table: *** 46.0-2ubuntu1 500 500 http://ca.archive.ubuntu.com/ubuntu noble/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: gdm3 46.0-2ubuntu1 ProcVersionSignature: Ubuntu 6.8.0-48.48-generic 6.8.12 Uname: Linux 6.8.0-48-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.28.1-0ubuntu3.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Nov 26 14:54:33 2024 InstallationDate: Installed on 2020-04-24 (1677 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) SourcePackage: gdm3 UpgradeStatus: Upgraded to noble on 2024-11-15 (11 days ago) modified.conffile..etc.default.apport: [modified] modified.conffile..etc.init.d.apport: [modified] mtime.conffile..etc.default.apport: 2020-05-04T10:55:44.853443 mtime.conffile..etc.gdm3.custom.conf: 2022-09-08T08:54:17.642371 mtime.conffile..etc.init.d.apport: 2024-07-22T10:59:07 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2089709/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
