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 Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2089709/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
