[Bug 1883002] Re: Dell Latitude 7300, i7-8665U, sig=0x806ec/20200609: hangs on Whiskey Lake

[Émile E]

Hi, after losing a whole day thinking this was a kernel problem (as you
would since rebooting to a different kernel usually solves it): I am
also hit by this with a brand new Dell Latitude 7300 / i5-8265U running
Mint 19.3 (Ubuntu 18.04). I observed it on AC (I didn't try on battery).
When it hangs I hear fan noise. The failure rate on warm reboots was
close to 100% until I used the PPA helpfully provided by vicamo to
revert to 20191115 from 20200609; I was then able to reboot several
times in a row so I think that fixed it.

Tell me if I can help by providing extra information. Firmware version
is 1.7.4.

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Title:
  Dell Latitude 7300, i7-8665U, sig=0x806ec/20200609: hangs on Whiskey
  Lake

Status in intel-microcode package in Ubuntu:
  Confirmed

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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