Hello,I faced the same issue on my Dell desktop (Xubuntu 18.04.02 LTS). The screen stayed black after been turn off by power management.
I didn't find the issue but I can share a workaround. I installed XscreenSaver and the issue disappeared.
Best regards Fabien -- xubuntu-users mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/xubuntu-users
