This might be related to bug 1876632. If so then switching users, switching VTs or resuming from suspend could be triggers.
Certainly driver support for GeForce 9400 is a problem if you want to run any current release of Ubuntu. So I think the best solution here is to stick to Xfce because it probably doesn't touch the GPU and won't trigger the same issues. ** Summary changed: - Progressive Wayland rendering corruption (titles, icons, wallpaper, Firefox tabs) on legacy NVIDIA Nouveau in 25.10 + [nouveau] Graphics corruption on GeForce 9400 ** Tags added: questing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2138586 Title: [nouveau] Graphics corruption on GeForce 9400 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2138586/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
