Oh maybe we could fix this in Plymouth without disabling the laptop
display...

If the CRTC_X / CRTC_Y / CRTC_W / CRTC_H properties behave how I think
they should then we could use them to maintain correct aspect ratio and
each monitor in its own native preferred resolution.

For example, displaying a 1920x1080 buffer in a 1920x1200 mode:

  CRTC_X = 0
  CRTC_Y = 60
  CRTC_W = 1920
  CRTC_H = 1080

Maybe those only exist for atomic KMS drivers though (like i915).

https://01.org/linuxgraphics/gfx-docs/drm/drm-kms-properties.html

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https://bugs.launchpad.net/bugs/1949677

Title:
  Vendor logo does not display in correct ratio on external monitor as
  it have different ratio than internal on

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