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

[Tyler Hicks]

Test kernels with the fix are available here:

http://people.canonical.com/~tyhicks/lp1759920/

You most likely only need linux-
image-4.13.0-38-generic_4.13.0-38.43+lp1759920.1_amd64.deb and linux-
image-extra-4.13.0-38-generic_4.13.0-38.43+lp1759920.1_amd64.deb

You should test that kernel without the noibpb and without the
apparmor=0 kernel command line options, and with the latest intel-
microcode package. When replying with testing feedback, please include
output from the following commands:

$ cat /proc/version_signature 
Ubuntu 4.13.0-38.43+lp1759920.1-generic 4.13.16
$ cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-4.13.0-38-generic root=UUID=c80800af-5af4-4235-9181-c366ef91c246 ro quiet splash vt.handoff=1
$ dmesg -t | grep -i microcode
microcode: microcode updated early to revision 0xc2, date = 2017-11-16
microcode: sig=0x406e3, pf=0x80, revision=0xc2
microcode: Microcode Update Driver: v2.2.

Thanks again for all of your help. This has been a tough one to track
down and it wouldn't have been possible without your help!

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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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