[Bug 1759920] Re: intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-image-4.13.0-37-generic)

[Diego Remolina]

@gordon-lack

>> FWIW: I just ran that on my system with the *old* microcode, and it

Define *old* microcode

Microcode can also come from the latest BIOS if you had updated. So if
you really wanted to be sure you have the original CPU microcode which
should be vulnerable, you will need to:

1. remove the intel-microcode package
2. rebuild the initrd for the kernel you want to run because the microcode is passed to the kernel
3. Make sure you are on an older BIOS release that did not include Intel microcode updates.

The *older* Ubuntu intel-microcode from January, may contain the first
Intel patches, so that is why you want to fully remove the package and
rebuilt initrd so that you get the microcode directly from CPU or BIOS.

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https://bugs.launchpad.net/bugs/1759920

Title:
  intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
  image-4.13.0-37-generic)

Status in intel-microcode package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Xenial:
  Confirmed
Status in linux source package in Xenial:
  Confirmed
Status in intel-microcode source package in Artful:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  I don't know if this is a problem with the kernel or the microcode,
  but we have a significant number of computers in our organization (on
  both 16.04 and 17.10) that fail if they have both updated.  Booting
  with either linux-image-4.13.0-36-generic or intel-microcode
  3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
  boot.

  ## Workaround ##
  1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary avoid the problem:
     https://wiki.ubuntu.com/Kernel/KernelBootParameters
  2. Install the previous version of package from
     https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb
  3. (Optional) Hold the package so that it won't be upgraded accidentally
     sudo apt-mark hold intel-microcode

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