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

[Jeremy Soller]

I have tested the patch posted, and it produces a bootable system with
19.04. We will be releasing the patched version of systemd in the
following PPAs:


Pop!_OS - https://launchpad.net/~system76/+archive/ubuntu/pop
Ubuntu support for System76 computers - https://launchpad.net/~system76-dev/+archive/ubuntu/stable

Please let me know what needs to happen to get this patch into Ubuntu
19.04

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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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