Plasmashell dumps core when disconnecting a third (hdmi) display

Please read this:

Correct.

Please read this:

Especially the What’s this upstream/downstream business as the answer is: it needs to be fixed in KDE and if it was fixed recently, the next update will incorporate the change.

In that case, read the rest of the N00b guide too! :grin: (at least the sections you’re not aware of)

:bowing_man: