[Bug 1939988] Re: GRUB2 can't boot Linux on HP Dragonfly G2

[Nicholas Stommel]

Okay wait a minute, it IS possible to install Ubuntu by writing the ISO
to the bootable key with dd from a machine running Linux. I used dd like
so: `sudo dd bs=4M if=/home/noctua/Downloads/ubuntu-21.10-desktop-
amd64.iso of=/dev/sdb conv=fdatasync status=progress` and I was amazed
that Ubuntu actually booted. It took some time to boot, but I was able
to use the installer successfully and I can confirm Ubuntu 21.10 works
fine on the Elite Dragonfly G2 (disable PSR using i915.enable_psr=0 in
the GRUB config kernel boot parameters after installation to eliminate
screen tear and lag). Definitely try doing that. It seems like the HP
system firmware has a flaw with being unable to boot certain things.
Given that the Fedora USB creator writes the raw ISO to the key, this
might be why a Fedora USB key works. I still think this is a flaw that
needs to be fixed, but at least there is a workaround.

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https://bugs.launchpad.net/bugs/1939988

Title:
  GRUB2 can't boot Linux on HP Dragonfly G2

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Hello!

  On HP Dragonfly G2 GRUB2 can not boot Linux. This issue is not
  reproducible with rEFInd or Fedora's GRUB2 (that launch vmlinuz as efi
  executable) but reproducible with Ubuntu 20.04.1, 21.04 and 21.10.

  After selection kernel in GRUB2 list there is just black screen, also
  reading from flash stop right there (judging by led on flash drive).
  Removing quiet splash, adding loglevel=10 and/or earlycon=efifb
  doesn't change anything, so it's really seems like kernel can not even
  start boot process.

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