[Bug 1883002] Re: intel-ucode 20200609: hangs on Whiskey Lake

[Steve Beattie]

Henrique, I didn't realize until today that the systemd tmpfiles.d would
also get triggered as part of the intel-microcode postinst in addition
to very early in the boot process. I have reverted it for focal (and
eventually groovy) because of the increased risk of instability and the
greater difficulty that it adds to recovery from a bad microcode update;
booting an earlier kernel/initramfs combination with an older microcode
embedded would still get the new bad microcode loaded via the tmpfiles.d
snippet.

I used this bug report as a reference for the upload, but re-opened the
issue as it's not clear whether an early-loaded microcode is a problem
for the reporter.

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https://bugs.launchpad.net/bugs/1883002

Title:
  intel-ucode 20200609: hangs on Whiskey Lake

Status in intel-microcode package in Ubuntu:
  Incomplete

Bug description:
  Basically the same symptoms as #1882809, but with 20.04 and on an
  i7-8665U (Dell Latitude 7300).

  Affected version is 3.20200609.0ubuntu0.20.04.0 (tested with kernels
  5.4.0-33 and 5.4.0-37)

  CPU:
  Vendor ID:                       GenuineIntel
  CPU family:                      6
  Model:                           142
  Model name:                      Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
  Stepping:                        12

  microcode: sig=0x806ec, pf=0x80, revision=0xca

  The first sign of a problem was a hard lockup while processing the new
  microcode package as part of a larger update; after fixing the
  resulting mess and completing the update (which regenerated the
  initramfs) I started having random lockups early in the boot process,
  with just "Loading initramfs" printed on the console.

  Downgrading intel-microcode to 3.20191115.1ubuntu3 and regenerating
  the initramfs fixes the problem.

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