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

[Andrea C]

3.20200609.0ubuntu0.20.04.2 installs cleanly, but there is still a problem with the new microcode causing freezes during boot.

I did some very unscientific testing in a couple of scenarios and came
up with the following numbers:

* on battery, cold boot: froze 1 out of 10 times
* on battery, warm boot: froze 6 out of 10 times
* on AC, cold boot     : froze 0 out of 10 times
* on AC, warm boot     : froze 9 out of 10 times

"Cold boot": system powered off, try to boot 5.4.0-37 in recovery mode to a root shell
"Warm booot": "reboot" from a root shell in 5.4.0-37, try to boot 5.4.0-37 in recovery mode to a root shell

So, while battery vs. AC seems to have some influence, the real
difference is in cold vs. warm boot.

When the system manages to boot, in the kernel log I get:

[    0.000000] microcode: microcode updated early to revision 0xd6, date = 2020-04-23
[    0.667433] microcode: sig=0x806ec, pf=0x80, revision=0xd6


I can run more tests if needed.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to intel-microcode in Ubuntu.
https://bugs.launchpad.net/bugs/1883002

Title:
  intel-ucode 20200609: hangs on Whiskey Lake

Status in intel-microcode package in Ubuntu:
  Fix Released

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1883002/+subscriptions