[Bug 1854764] Re: Dell 5280 hangs on warm reboot after upgrading intel-microcode package

[Steve Beattie]

I don't believe the boot mode should matter.

I have prepared a proposed revert for bionic in the Ubuntu Security
Proposed ppa: https://launchpad.net/~ubuntu-security-
proposed/+archive/ubuntu/ppa/ that downgrades the microcode from
0x2000065 to 0x2000064 for processors with signature 0x00050654. It
would be great if you could confirm the version
3.20191115.1ubuntu0.18.04.2 stops the hanging behavior after warm
reboots for your systems.

I'm in the process of preparing packages for the rest of the supported
Ubuntu releases.

Thanks again.

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https://bugs.launchpad.net/bugs/1854764

Title:
  Dell 5280 hangs on warm reboot after upgrading intel-microcode package

Status in intel-microcode package in Ubuntu:
  Confirmed

Bug description:
  We have brand-new Dell T 5280 workstations (Intel Xeon W-2133 3.6 GHz
  (3.9 GHz Turbo), 6 Cores) with latest BIOS (1.13.1) and Ubuntu 18.04.3
  LTS

  $ uname -a
  Linux hostname 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:11 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  $ lsb_release -rd
  Description:    Ubuntu 18.04.3 LTS
  Release:        18.04

  $ dpkg -l | grep linux-image-4 | grep ^i
  ii  linux-image-4.15.0-66-generic              4.15.0-66.75                                    amd64        Signed kernel image generic
  ii  linux-image-4.15.0-70-generic              4.15.0-70.79                                    amd64        Signed kernel image generic

  $ cat /proc/cpuinfo
  processor       : 0
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 85
  model name      : Intel(R) Xeon(R) W-2133 CPU @ 3.60GHz
  stepping        : 4
  microcode       : 0x200005e
  cpu MHz         : 1200.410
  cache size      : 8448 KB
  physical id     : 0
  siblings        : 12
  [...]

  After upgrading the 'intel-microcode' package from
  3.20180312.0~ubuntu18.04.1 to 3.20191115.1ubuntu0.18.04.1 the machine
  hangs upon a warm restart (reboot --> black screen, cursor blinking in
  the top left corner). Powering off the machine and turning it on again
  will boot just fine.

  Removing the intel-microcode package will and rebooting twice will fix
  the issue. After reinstalling version 3.20180312.0~ubuntu18.04.1 the
  machine will still be booting correctly.

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