Yes, sorry. I can confirm the bug exists in 18.04. It is trivial to reproduce, which is unusual :(
When the screen freezes multiple process start spinning: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 13113 dan 20 0 12.947g 7.897g 7.788g R 91.0 51.5 1:00.90 gnome-shell 13773 dan 20 0 2169752 277244 142700 S 46.2 1.7 0:17.66 firefox 13832 dan 20 0 2039840 165760 109716 S 28.6 1.0 0:10.49 Web Content 13132 dan 20 0 1241100 241772 220172 S 13.3 1.5 0:09.01 Xwayland To un-freeze the system I just have to: killall -9 firefox This is a scary bug because it's also spinning consuming memory (see the above list). I will get the upstream Gnome guys to look at this ASAP. ** Changed in: gnome-shell (Ubuntu) Status: Incomplete => Confirmed ** Changed in: gnome-shell (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1749779 Title: System freeze when going back and forth fullscreen mode with Firefox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1749779/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs