E7470 on Dell dock 0PDXXF here as well. LCD(eDP-1)+DVI(DP-1-1)+VGA(DP-1-3).
Intel graphics only.

I'm running 4.4.0-79-lowlatency now.

DISTRIB_ID=neon
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="KDE neon User Edition 5.10"

I've found out that graphics come up after I switch to vt1 (Ctrl-Alt-F1)
for a while and then back (Alt-F7). I didn't try more than once,
displays just came up.

I've also noticed that -78 worked fine if I rebooted from -72 without
powering the machine off.

Does this trick work for anybody else?

Cheers
Tharrrk

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https://bugs.launchpad.net/bugs/1686189

Title:
  External monitor connecting problem on Intel graphics card

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