I edited /etc/gdm3/custom.conf and put WaylandEnable=false back in (I
had it enabled before to test). Greeter came right up on reboot and my
external monitor works again.

What is curious is that my session choice in both cases was/is Gnome on
Xorg. So is it possible there's some change in the greeter's behavior?
As to using wayland or not.

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.

  GDM freeze

Status in gdm3 package in Ubuntu:
Status in gnome-shell package in Ubuntu:
Status in xorg package in Ubuntu:

Bug description:
  Here is what I know so far:

  After rebooting this morning on Bionic (after receiving the gnome
  theme updates, I think), upon reboot the CPU pegs and the greeter is
  never displayed (there is a graphics system running, but I'm not sure
  what it's doing). My num lock / caps lock keys work, but the touchpad
  on the laptop does nothing to the mouse.

  If I boot with nomodeset, greeter does not freeze.

  Finally, in either case, I am now unable to use my external monitor,
  which worked fine before (connected over a USB-C to HDMI dongle).

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Mon Mar  5 11:47:53 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GpuHangFrequency: This is the first time
   Intel Corporation HD Graphics 520 [8086:1916] (rev 07) (prog-if 00 [VGA 
     Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:3800]
  InstallationDate: Installed on 2015-12-17 (809 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 
  MachineType: LENOVO 80MK
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-10-generic 
root=UUID=c0742e7a-578f-4be5-bd9e-05b9e92f5b00 ro noprompt persistent quiet 
splash nomodeset
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/29/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: C6CN34WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: VIUU4
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0K45914 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo YOGA 900-13ISK
  dmi.product.family: IDEAPAD
  dmi.product.name: 80MK
  dmi.product.version: Lenovo YOGA 900-13ISK
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:
  version.libdrm2: libdrm2 2.4.90-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc4-1ubuntu3
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc4-1ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
  xserver.bootTime: Mon Mar  5 11:17:58 2018
  xserver.configfile: default
   open /dev/dri/card0: No such file or directory
   open /dev/dri/card0: No such file or directory
   Screen 0 deleted because of no matching config section.
   AIGLX: reverting to software rendering
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.6-1ubuntu2

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