[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 09:40 schrieb Mirek Ingr:
> Sure thing, here you are:
> $ grep -i microcode /proc/cpuinfo
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6
> microcode	: 0xd6

Thank you.

> The output of 'dmesg' is attached as a file.

Ah. Your buffer is too small. As it’s a ring buffer, earlier messages 
get overridden. Either increase the size on the Linux command line with 
for example `log_buf_len=4M`, or, if the systemd journal is running, it 
should store all Linux kernel messages too:

     $ journalctl -k

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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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