[Bug 2085507] Re: Boot logo displayed in incorrect aspect ratio

[Daniel van Vugt]

Oh, sorry. I misinterpreted the problem. Looking at your photos again I
can see the HP logo is only the correct aspect when the Ubuntu logo is
too wide. And the HP logo is too narrow when the Ubuntu logo is the
correct aspect.

This means the manufacturer has intentionally designed the HP boot logo
for non-square pixels. Which supports the earlier observation that the
machine is booting in a non-native resolution.

As far as I can tell, this is not an explicit violation of the spec:

https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#boot-
graphics-resource-table-bgrt

But Microsoft's definition of the spec suggests that the field at offset
32 should be used to specify which graphics mode the BIOS logo requires
to be displayed correctly:

https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/boot-
screen-components

I'm not sure that's something Plymouth can or will support given it
doesn't seem to be within the official spec.


** Summary changed:

- Boot logo displayed in incorrect aspect ratio
+ Boot logo displayed in incorrect aspect ratio for laptops that boot at non-native resolution

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https://bugs.launchpad.net/bugs/2085507

Title:
  Boot logo displayed in incorrect aspect ratio for laptops that boot at
  non-native resolution

Status in plymouth package in Ubuntu:
  Won't Fix

Bug description:
  I've seen this for many years with different Ubuntu versions. Right now on 24.10 
  A computer may display "Asus" logo or "Dell" just fine during the GRUB part of boot. later in the boot, when the "Ubuntu 20 years" logo appears the aspect ratio of the vendor is horizontally squished. 
  Same malformed manufacturer logo is displayed on shutdown.

  note: This never happens on a newly installed system, but seems to appear after first release upgrade.
  this is not new to 24.10

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