This is something I have been having on and off for a while and never
got round to reporting (I don't really have anything of bug-report
quality). Sometimes when using GNOME Shell/Wayland on an external
monitor with my laptop closed some applications (probably all X11 ones)
stop responding to mouse events. I can still drag the windows and
interact with them via the keyboard. Opening and closing the laptop,
which triggers a screen reconfiguration, usually makes this go away, for
a while or for longer. I don't think I have ever seen this on the
laptop screen. I can't really say what triggers it in the first place
though. Is this anything known?
Using Ubuntu 18.04 explicitly set to a Wayland session, GNOME Shell
3.26.2-0ubuntu3, Mutter 3.26.2-1 plus one patch, though I have been
seeing this with both patched and unpatched Mutter.
Michael Thayer | VirtualBox engineer
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