Thanks for the response.  There is quite a lot going on here.

First off - The XPS 9570 is a CFL system.

The going black in the first place is an artifact what fwupd does to
query the firmware on the MST hubs in the dock.  What it does is "wakes"
the MST hubs by putting them into a higher power mode.  When in this
mode 1-2 "fake monitors" shows up in DPCD of the DP aux channel.  This
allows applications such as fwupd to interact with the monitor.  The
flicker and going black is the i915 driver probing those "fake"

To me this is all expected behavior thus far.

Something that (I think?) might help is if the graphics drivers can
blacklist the EDID associated with the fake monitors to prevent re-
probing them but still letting communication with them work for fwupd.
That needs to be discussed with the Intel graphics folks to see if
that's a possibility.

If it's not, then we have to have a tradeoff of no version is registered
with fwupd when no (or not enough) monitors are plugged into the dock.

Now with 4.19, the staying black sounds like a separate graphics driver bug.
It might be useful if you can test with drm-tip and still reproduce that.  if 
so, then this is worth reporting to Intel's graphics bugzilla to investigate.

The USB not working, I would wonder if it's actually an artifact of the
above bug.  Userspace is hung and so bolt isn't authorizing the
thunderbolt device meaning USB won't work.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: fwupd (Ubuntu)
       Status: New => Triaged

** Changed in: fwupd (Ubuntu)
   Importance: Undecided => Medium

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Title: w/dell TB16 Dock blanks the display

Status in fwupd package in Ubuntu:
Status in linux package in Ubuntu:

Bug description:
  Absolutely reproducible in Ubuntu 18.04.1 Gnome 3 UI with a Dell XP15
  laptop and a Dell TB16 dock.

  A few seconds after logging into the Gnome 3 UI, something in the UI
  starts the fwupd.service. About 2 seconds later, the display goes
  blank and does not come back. There is no obvious recovery short of
  killing all the user's processes, and then logging back in.  A second
  login does not reproduce the problem, since the fwupd service is now
  running, and does not restart. However manually restarting the fwupd
  service causes the problem to recur.

  The problem does not occur if the "dell" module is blacklisted in

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: fwupd 1.0.6-2
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
  Uname: Linux 4.15.0-39-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec  2 22:02:31 2018
  InstallationDate: Installed on 2018-11-19 (13 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
  SourcePackage: fwupd
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.fwupd.daemon.conf: 2018-12-02T21:41:51.195270

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