[Bug 1925064] Re: shim(-signed)? does not boot on T420

[Steve Langasek]

Andreas, can we close this out?  I seem to remember you saying on IRC
that you were able to re-upgrade and not hit this bug; and it's now been
several weeks so if there's still an issue we want to figure it out.

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Title:
   shim(-signed)? does not boot on T420

Status in shim package in Ubuntu:
  New

Bug description:
  Almost identical to bug #1925010, but the T420 is an UEFI v2.00
  machine, so I'm filing this separate bug.

  This is a T420 in uefi mode, but not secure boot. I was running
  groovy, and just upgraded to hirsute with do-release-upgrade -d. It
  just wouldn't boot from the disk anymore after that. Black screen, no
  disk activity, no ctrl-alt-del response. I always had to power cycle
  it.

  I then performed the steps from comment 2 of that bug, and the machine booted normally after that:
  """
  Can you please check that the machine boots with just grub without shim.

  Aka, replace /EFI/Boot/BOOTX64.efi & /ef/ubuntu/shimx64.efi files wtih /efi/ubuntu/grubx64.efi => this could possibly be a workaround, given that secureboot is not possible on Mac platforms.
  """

  
  My BIOS version is 1.49 (83ET79WW), model is 4177CTO. I can attach more info if needed, and it's also simple to restore the buggy behavior.

  dmesg says "efi: EFI v2.00 by Lenovo"

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