[Bug 1835809] [NEW] AMD Ryzen 3000 series fails to boot

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sebastien Bacher (seb128):

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.

** Affects: systemd (Ubuntu)
     Importance: High
         Status: New


** Tags: patch
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AMD Ryzen 3000 series fails to boot
https://bugs.launchpad.net/bugs/1835809
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