[Bug 1949677] Re: Vendor logo does not display in correct ratio on external monitor as it have different ratio than internal on

[Daniel van Vugt]

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

Status in OEM Priority Project:
  Confirmed
Status in plymouth package in Ubuntu:
  New

Bug description:
  As Ubuntu boots up, the vendor logo will be retrieved and displayed on
  the monitor.

  Per test, as internal and external monitors have different Wide/Hight
  ratios, Plymouth will use the monitor ratio of the internal monitor,
  and the vendor logo will be displayed on both monitors.

  Some laptops can boot up even as it's the lid is close, and use the
  external monitor, keyboard, and mouse only.

  For that case:

  - internal monitor: off
  - external monitor: display the vendor still in the internal monitor ratio.

  Which is ok but not perfect.

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