[Bug 1835809] Re: AMD Ryzen 3000 series fails to boot

[Adam Conrad]

FWIW, I think not booting a 19.04 ISO is probably fine, and it's not
worth spinning a point release for this.  "I can't install a 9mo release
on this hardware" is unforunate, but not world-ending.

However, we should definitely SRU this for people who are likely to take
their EXISTING 19.04 system with a Ryzen 1xxx/2xxx and drop in a 3xxx
and find it doesn't boot anymore.  Also, obviously, we should make sure
it's fixed for 19.10.

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Title:
  AMD Ryzen 3000 series fails to boot

Status in systemd package in Ubuntu:
  New

Bug description:
  On the new AMD Ryzen 3000 series CPUs, there is an issue with systemd
  preventing the boot process from completing. This issue does not
  affect the older systemd version in 18.04, but affects the 19.04
  version.

  Here is a screenshot showing what happens:
  https://www.phoronix.net/image.php?id=ryzen-3700x-3900x-linux&image=amd_zen2_14_show

  I am currently testing a patch to systemd, derived from this pull request:
  https://github.com/systemd/systemd/pull/12536

  This is a high severity issue, as I do not believe there is no
  potential workaround without either a firmware update or an ISO
  respin.

  I have attached a rebase of the potential patch on the current 19.04
  version of systemd for reference. I will provide more details after
  testing.

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