I must correct my findings re the XPS 13 Developer Edition. (I'm sorry!)

The external monitor works fine. It really seems to be specific to the
Lenovo hardware.

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  Lenovo X1 Carbon 6th Gen. HDMI not working for external monitor

Status in linux package in Ubuntu:

Bug description:
  I have an X1 Carbon 6th Gen. (Intel Core i7 8th Gen, 16 GB RAM, 512 GB

  When I try to attach an external monitor via an HDMI cable the monitor
  receives no signal. Similarly, when I use the Thunderbold dock and
  attach two monitors (one via HDMI, one with DisplayPort) only the
  monitor attached with DisplayPort works; the monitor attached with
  HDMI stays black.

  This made me think if this is really a bug in the software. I saw people 
describing this issue with Windows installed; the solution was to hit a special 
key combination. Unfortunately, the multimedia keys all not all functional, 
specifically the F7 key, which seems to meant for "activate external monitor", 
has no function.
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC1:  peter      3510 F.... pulseaudio
   /dev/snd/controlC0:  peter      3510 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=8aee1825-7879-4889-8de3-e57900548385
  InstallationDate: Installed on 2018-04-06 (5 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403)
  MachineType: LENOVO 20KHCTO1WW
  Package: linux (not installed)
   0 EFI VGA
   1 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
   linux-restricted-modules-4.15.0-13-generic N/A
   linux-backports-modules-4.15.0-13-generic  N/A
   linux-firmware                             1.173
  Tags:  bionic
  Uname: Linux 4.15.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/27/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N23ET37W (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.product.family: ThinkPad X1 Carbon 6th
  dmi.product.name: 20KHCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 6th
  dmi.sys.vendor: LENOVO

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