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

[Hannu Koivisto]

Kubuntu 17.10, kernel 4.13.0-37-generic, Dell E6330 with Intel graphics
(iucode-tool: system has processor(s) with signature 0x000306a9, cpuinfo
attached), after intel-microcode upgrade to 3.20180312.0~ubuntu17.10.1
=> lockup during boot after entering disk encryption password but before
login screen appears.

Boot with 4.13.0-36-generic => no problem.

** Attachment added: "cpuinfo.txt"
   https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+attachment/5096159/+files/cpuinfo.txt

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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 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.

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