[Bug 1759920] Re: linux-image-4.13.0-37-generic locks up at login screen with intel-microcode 3.20180312.0

[Erich E. Hoover]

> Does the lockup happen as soon as you reach the login screen or does
it happen once you put in your password and hit enter?

It sometimes happens as soon as the login screen shows up, sometimes it
happens after you hit enter, and roughly 1:8 tries it will make it all
the way to the desktop.

> Do you happen to use NVIDIA graphics drivers on the system that's
locking up?

I believe that all of our systems are running NVIDIA drivers, but we
have replicated it on a system not running the NVIDIA driver.

> Erich, could you include the output of 'iucode-tool --scan-system'?

Most of them report:
iucode-tool: system has processor(s) with signature 0x000906e9
We have one that reports:
iucode-tool: system has processor(s) with signature 0x000906ea

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

Title:
  linux-image-4.13.0-37-generic locks up at login screen with intel-
  microcode 3.20180312.0

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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