[Bug 1882943] Re: Dell Latitude 5591, i7-8850H, sig=0x906ea/20200609, Boot freezes silently after 'intel-microcode' upgrade

[Paul Menzel]

Am 18.09.20 um 09:13 schrieb Mirek Ingr:
> $ dmesg | grep microcode
> <nothing>

Please attach the whole output.

> $ iucode-tool -Sv
> iucode-tool: system has processor(s) with signature 0x000906ea
> iucode-tool: assuming all processors have the same type, family and model
> 
> 
> $ lscpu
> Architecture:                    x86_64
> CPU op-mode(s):                  32-bit, 64-bit
> Byte Order:                      Little Endian
> Address sizes:                   39 bits physical, 48 bits virtual
> CPU(s):                          12
> On-line CPU(s) list:             0-11
> Thread(s) per core:              2
> Core(s) per socket:              6
> Socket(s):                       1
> NUMA node(s):                    1
> Vendor ID:                       GenuineIntel
> CPU family:                      6
> Model:                           158
> Model name:                      Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
> Stepping:                        10

[…]

Please also paste the output of `grep -i microcode /proc/cpuinfo`.

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https://bugs.launchpad.net/bugs/1882943

Title:
  Dell Latitude 5591, i7-8850H, sig=0x906ea/20200609, Boot freezes
  silently after 'intel-microcode' upgrade

Status in OEM Priority Project:
  New
Status in intel-microcode package in Ubuntu:
  Confirmed

Bug description:
  1) # apt dist-upgrade froze suddenly,
  2) and Ubuntu's boot sequence had frozen completely, silently (no warnings nor errors even in debug mode!!) and permanently,
  3) after many trials  to recover the system,
  4) I added 'dis_ucode_ldr' boot option to Grub2/Ubuntu configuration,
  5) and hurray, the system booted finally :)

  There must be something wrong with:
  a) CPU firmware
  b) intel-microcode package

  Dell Latitude 5591, Intel Core i7-8850H

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