I'm running Xubuntu 18.0.03, which hasn't reached end-of-life, and this
bug is still present. It was introduced when I upgraded to kernel 5.0
with xorg 1.20.4-1ubuntu3~18.04.1. It can be circumvented using either
of 2 methods:

1. Uninstalling light-locker and installing xscreensaver
or
2. As suggested by @bbethge, created /etc/X11/xorg.conf.d/20-intel.conf:
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
EndSection

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https://bugs.launchpad.net/bugs/1801609

Title:
  Fails to deactivate dpms off mode after user initiated wake-up
  events(not system-suspended, just locked and dpms active)

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