[Bug 1869120] Re: Shim bootloader hangs before Grub menu with 4K monitor

[Julian Andres Klode]

It's already in focal-proposed, hence I mentioned proposed pocket.
Anyway it's fixed in groovy, so marking done.

** Changed in: shim-signed (Ubuntu)
       Status: Fix Committed => Fix Released

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Title:
  Shim bootloader hangs before Grub menu with 4K monitor

Status in shim-signed package in Ubuntu:
  Fix Released

Bug description:
  I recently swapped out my WUXGA monitor for a much bigger 4K monitor.
  Most unexpectedly, I found that this prevented my workstation from booting.

  When I start up, I see the power-on splash screen from the workstation
  motherboard.  I should next see the Grub menu, but instead I get a
  blank screen, and the boot-up hangs indefinitely.

  If I unplug my monitor for the first few seconds of a power-up, until
  the Grub menu has come and gone, I can re-plug the monitor and watch
  the rest of the boot-up into the initramfs and my system.

  If I use my old, small monitor, boot-up works.

  I solved the problem by using efibootmgr to change the boot loader
  from /EFI/ubuntu/shimx64.efi to /EFI/ubuntu/grubx64.efi.  With this
  change, the system boots properly with the new monitor: I see power-on
  splash screen, Grub menu, initramfs messages, etc.

  For all the above, Secure Boot is enabled by my firmware.
  Another way I can fix the boot hang is to turn off Secure Boot.
  Then my workstation boots normally with shimx64.efi.
  (It is counter-intuitive to me that Shim is the boot loader blocked
  by Secure Boot, but that's what I observe.)

  To summarize: of the 3 variables I explored, the only combination
  that fails is Secure Boot, a 4K monitor, and shimx64.efi.

  It seems someone else had the same problem with a new monitor in 2016:
  https://ubuntuforums.org/showthread.php?t=2301071&page=37

  I am running Ubuntu 18.04.4 ("Bionic").
  My motherboard is an ASUS P10S WS, firmware version 3801.
  grubx64.efi is from grub-efi-amd64-signed version 1.93.16+2.02-2ubuntu8.15
  shimx64.efi is from shim-signed version 1.37~18.04.3+15+1533136590.3beb971-0ubuntu1
  I also have shim version 15+1533136590.3beb971-0ubuntu1 installed.

  I am happy to run experiments on my hardware for you.

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