*** This bug is a duplicate of bug 1813663 ***

My laptop (HP EliteBook 850 G2) hangs on attempt to suspend with similar
looking backtrace. Hard poweroff is required to recover.

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  kernel bug null pointer dereference

Status in linux package in Ubuntu:

Bug description:
  After upgrading to linux-image-4.15.0-44-generic via the update
  manager today, I can't log in anymore. The login screen appears, but
  as soon as I've entered my password and hit enter, the desktop locks
  up, keyboard stops working and display goes black. Network is still
  working, so I could login remotely and see the crash live via
  journalctl. I attached the full output of journalctl -k -b -1

  In short it says

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000245
  IP: intel_ddi_post_disable+0x54/0x170 [i915]
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP PTI

  Infos about my hardware:

  lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:    18.04

  apt-cache policy linux-image-4.15.0-44-generic
    Installiert:           4.15.0-44.47
    Installationskandidat: 4.15.0-44.47
   *** 4.15.0-44.47 500
          500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
          100 /var/lib/dpkg/status

  Rebooting to the previous kernel 4.15.0-43 doesn't have this issue and
  I can login without issues.

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