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[Launchpad Bug Tracker <1854764@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package intel-microcode - 3.20191115.1ubuntu2

---------------
intel-microcode (3.20191115.1ubuntu2) focal; urgency=medium

  * REGRESSION UPDATE: warm reboots cause hangs on certain Skylake
    processors (LP: #1854764)
    + Reverted microcode (from revision 0x2000065):
      sig 0x00050654, pf_mask 0xb7, 2019-07-31, rev 0x2000064, size 33792

 -- Steve Beattie <sbeattie@xxxxxxxxxx>  Mon, 02 Dec 2019 10:23:56 -0800

** Changed in: intel-microcode (Ubuntu Focal)
       Status: In Progress => Fix Released

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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:
  Fix Released
Status in intel-microcode source package in Xenial:
  Fix Released
Status in intel-microcode source package in Bionic:
  Fix Released
Status in intel-microcode source package in Disco:
  Fix Released
Status in intel-microcode source package in Eoan:
  Fix Released
Status in intel-microcode source package in Focal:
  Fix Released

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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