[Bug 1911893] Re: latest microcode is not working properly on intel core i9

[Alex Murray]

Microcodes are specific to CPU models - so in my testing on 3 different
machines with this same CPU model I didn't observe this issue. However,
on your machine you do see the issue, which leads me to think this is
specific to your machine.

I suspect the issue in your case occurs when the microcode is loaded in
early boot - with the older intel-microcode package, it is likely the
same version as the microcode that is packaged in your BIOS - and so no
microcode would get loaded in early boot as they are the same. Now that
we have updated the intel-microcode package to contain the newer
microcode release from Intel, this will get loaded in early boot since
it is newer than the microcode in your BIOS and so triggers this bug.
And since we haven't observed this bug on other machines I can only
suspect the bug is either hardware specific to your machine / model.

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https://bugs.launchpad.net/bugs/1911893

Title:
  latest microcode is not working properly on intel core i9

Status in intel-microcode package in Ubuntu:
  New

Bug description:
  When using latest ubuntu LTS I can see black screen. Latest working
  version 3.20191115.1ubuntu3. Please fix the bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: intel-microcode 3.20200609.0ubuntu0.20.04.2
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.445.1
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jan 15 10:13:34 2021
  LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: intel-microcode
  UpgradeStatus: No upgrade log present (probably fresh install)

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