This happened in Xorg and Wayland. I have tried restarting the shell by logging out, but nothing has changed. It is still a black screen; only the TV is not. I also tried to switch TTY (ctrl + alt + F3) and back again (ctrl + alt + F1), nothing happened. The last thing I did was restart the display manager (sudo systemctl restart gdm) in the terminal, but it still has the same result.
I also noticed that this bug occurred when the laptop was in lock screen mode, and the screen was blank because I left for a few minutes. In this situation, the TV screen is blank too. I set the screen blank in 5 minutes in the settings. This is just my opinion that maybe the problem is automatic suspend in settings, but I haven't figured out what would happen if I turn it off. I don't know whether this bug only happens on my device, or there is another device that has the same problem. The only option I have is shut down the laptop after unplug the HDMI by pressing the power button and waiting 60 seconds. After that, I turn on the laptop again. This is the only information I can share. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/2138173 Title: blank screen when external monitor is not connected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2138173/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
