[Bug 2073634] Re: [SRU] Enable suppression of /EndEntire message

[Mate Kukri]

Already fixed in Oracular.

SRU for noble, jammy, and focal (which will just be a binary copy of
jammy) prepared in the build PPA.

This will need an uploader (subscribing juliank).

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https://bugs.launchpad.net/bugs/2073634

Title:
  [SRU] Enable suppression of /EndEntire message

Status in OEM Priority Project:
  New
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Focal:
  Confirmed
Status in grub2 source package in Jammy:
  Confirmed
Status in grub2 source package in Noble:
  Fix Committed
Status in grub2 source package in Oracular:
  Fix Released

Bug description:
  [ Impact ]

   * Many Ubuntu Core customers require a boot sequence that displays a
  custom splash image up until ubuntu-frame loads. Unfortunately, GRUB
  interrupts this process, printing two "/EndEntire" messages to the
  display.

   * Ideally, this should be able to be suppressed via configuration, at
  least on devices running Ubuntu Core, as it likely desirable behavior
  on Classic systems.

   * The message only happens with Ubuntu Core, because Ubuntu Core is
  using chainloader of GRUB to load the kernel EFI image.

  [ Test Plan ]

   * Boot a Ubuntu Core image on an AMD64 device with UEFI support

   * During the boot process, check if the console shows "/EndEntire"
  and "file path: /ACPI..."

   * Test that the re-built GRUB doesn't cause any boot regressions either when
     booting from disk or network.

  [ Where problems could occur ]

   * Removing or suppressing the messages is unlikely to cause any
  regression.

   * Rebuilding and updating the bootloader always has unforeseen regression
     potential, but the appropriate testing should be performed to mitigate
     this as much as possible.

  [ Other Info ]

   * None

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