I forgot to add:
in my tracing of libqxcb, I found that this library conflates screens with
outputs.
When there are no more Outputs connected,
it returns 0 screens.
Traditionally an X screen could exist independently of its outputs.
The actual packages that will need to work to fix this very important
issue are:
libqxcb (Qt5)
xserver-xorg-video-intel (or intel graphics driver)
xrandr
Patching libqxcb is not enough. The crash happens later in the chain of events
if so (I tried and tried).
It seems plasma and Qt5 cannot function without outputs. Other graphic
environments "solve" this by always providing at least one mock or virtual
output, when all physical monitors have been unplugged or asserted HotPlug pin
19 of HDMI.
--Juan Manuel Cabo
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https://bugs.launchpad.net/bugs/1492778
Title:
kde crashes when turning powering on display port monitor
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