[Bug 1813796] Re: kernel bug null pointer dereference

*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663

Also happening on a Dell Precision 5520. Works fine without doc. Screen
goes black and system locks up after login if docked. Cold boot is only
option.

Booting to 4.15.0-43 works fine.

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https://bugs.launchpad.net/bugs/1813796

Title:
kernel bug null pointer dereference

Status in linux package in Ubuntu:
Incomplete

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
linux-image-4.15.0-44-generic:
Installiert: 4.15.0-44.47
Installationskandidat: 4.15.0-44.47
Versionstabelle:
*** 4.15.0-44.47 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
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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