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[Launchpad Bug Tracker <1831789@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2 - 2.04-1ubuntu26.3

---------------
grub2 (2.04-1ubuntu26.3) focal; urgency=medium

  * 2.04-1ubuntu27 and 2.04-1ubuntu28 folded together for focal
  * debian/patches/ubuntu-flavour-order.patch:
    - Add a (hidden) GRUB_FLAVOUR_ORDER setting that can mark certain kernel
      flavours as preferred, and specify an order between those preferred
      flavours (LP: #1882663)
  * debian/patches/ubuntu-zfs-enhance-support.patch:
    - Use version_find_latest for ordering kernels, so it also supports
      the GRUB_FLAVOUR_ORDER setting.
  * debian/patches/ubuntu-dont-verify-loopback-images.patch:
    - disk/loopback: Don't verify loopback images (LP: #1878541),
      Thanks to Chris Coulson for the patch
  * debian/patches/ubuntu-recovery-dis_ucode_ldr.patch
    - Pass dis_ucode_ldr to kernel for recovery mode (LP: #1831789)
  * debian/patches/ubuntu-add-initrd-less-boot-fallback.patch:
    - Merge changes from xnox to fix multiple initrds support (LP: #1878705)
  * debian/patches/ubuntu-clear-invalid-initrd-spacing.patch:
    - Remove, no longer needed thanks to xnox's patch
  * Ensure that grub-multi-install can always find templates (LP: #1879948)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 17 Aug 2020 16:04:31
+0200

** Changed in: grub2 (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1831789

Title:
  Add "dis_ucode_ldr" to linux boot options for Recovery Mode

Status in grub2 package in Ubuntu:
  Fix Released
Status in grubzfs-testsuite package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed
Status in grub2 source package in Bionic:
  Fix Committed
Status in grub2 source package in Focal:
  Fix Released
Status in grubzfs-testsuite source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Fix Released
Status in grubzfs-testsuite source package in Groovy:
  Fix Released

Bug description:
  [Impact]
  Due to some recent problems with a microcode update which broke booting of some laptops I suggest adding "dis_ucode_ldr" to recovery mode boot options to allow booting after a bad microcode update.

  See the following topics that describe the problems:
   - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829620
   - https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/1

  When such problems occur it's very hard to see that the microcode
  loading is the issue, the booting just hangs at the purple screen,
  even removing "quiet splash" or using the recovery option will not
  show the error.

  We'll need to double check that dis_ucode_ldr works as expected across all architectures.
  According to the kernel docs (Documentation/admin-guide/kernel-parameters.txt), dis_ucode_ldr is x86 only, so my guess is that it will be ignored for other architectures. According to the kernel code  (arch/x86/kernel/cpu/microcode/core.c), dis_ucode_ldr works for both AMD and Intel.
  I have some time tomorrow on test this on a ARM device.

  This was also discussed Ubuntu Developer mailing list where it was
  suggested to post this here, see: https://lists.ubuntu.com/archives
  /ubuntu-devel/2019-June/040725.html

  [Test case]
  Check that dis_ucode_ldr is present on Linux entries (zsys support in focal+ is verified by grubzfs-testsuite changes)

  [Regression potential]
  If you actually require microcode updates to get into userspace, your recovery option won't work anymore. Does this happen? Seems unlikely.

  For grubzfs-testsuite, given that it is not installed, the only
  regression could be failing tests.

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