This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1746418

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: artful

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https://bugs.launchpad.net/bugs/1746418

Title:
  System freezes when starting Xorg after installing linux-
  image-4.13.0-32-generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My laptop (Lenovo T440) freezes when starting Xorg (lightdm) only
  after installing the latest ubuntu kernel for 17.10, linux-
  image-4.13.0-32-generic.

  Am running Xorg instead of MIR due to MIR crashing when I initially
  upgraded from 17.04 to 17.10, but that's a different problem for a
  different day. It's been running with Xorg stably for at least 2-3
  months.

  If I boot with the previous kernel version on my /boot (linux-
  image-4.13.0-25-generic), everything works fine.

  If I boot with the latest mainline kernel from the Ubuntu mainline
  repo (4.15.0), everything works.

  Using grub's option to run "Recovery Mode" for the 4.13.0-32 kernel, I
  am able to use the CLI and access the encrypted root filesystem, which
  is how I generated the apport repo that's attached. It's only when
  telling it to continue Normal booting that it freezes, which is why I
  suspect the problem of being Xorg.

  When the system freezes, the fan starts to spin up. I cannot switch
  virtual consoles using CTRL-ALT-F{1-7}. CTRL-ALT-DEL pressed
  repeatedly doesn't do anything. To reboot, I have to hold the power
  button until the system powers off.

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