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I've seen a number of posts on Ubuntu talking about how to change global scaling; not what I'm looking for. The greeter/login screen on certain HiDPI resolution settings is unacceptably small and I'd like to enlarge without cranking up the scaling globally. I used to accomplish this with slick-greeter but with Wayland/GDM3 these settings seem ignored. Any way to change the greeter resolution to scale 2x without impacting the rest of the gtk (post-login) scaling?

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I have solved this issue in a very arcane way, I'm sure there's an easier way to do what I did, but here are the steps I took:

  • Installed gdm-tools
  • Followed the steps mentioned in this article
  • ran sudo glib-compile-schemas /usr/share/glib-2.0/schemas as per the above article, after creating the file /usr/share/glib-2.0/schemas/93_hidpi.gschema.override with scaling-factor=2
  • rebooted, greeting screen was at 200%
  • logged in, desktop was also at 200% (not desired)
  • settings|displays, set desktop to 100%
  • rebooted, now login/greeter screen was scaled 2x but desktop was desired 100%
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