*** This bug is a duplicate of bug 1505409 ***
https://bugs.launchpad.net/bugs/1505409
the exact same is happening to me, also on a latitude e7470, but with
arch linux, 4.14.6 kernel.
I can also reproduce this behaviour including the not-in-reality-existing
monitor showing up in xrandr in Ubuntu 17.10 live ISO. Latest Fedora 28 live
also affected. As this problem doesn't go away with booting LTS kernels, I
suppose it's not a kernel related bug, nor related to video drivers.
I'm also not sure if this is really a duplicate of bug #1505409, as this is new
behavior and nothing a bug from 2015 could be. Ubuntu 16.04/10 not affected for
example.
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https://bugs.launchpad.net/bugs/1727320
Title:
Screen turn on/off 3 times and DP-1-3 connected but nothing is
connected [latitude e7470]
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