I have the exact same issue with:
- Lenovo X260 (Core i5 - 16GB RAM)
- Lenovo Thinkpad Pro Dock 40A10065UK
I have tested and reproduced with both Ubuntu and Kubuntu.
I have also tested changing GDM3 to LightDM, to SDDM, as the freeze happened
when they were about to load and I thought it was a problem with GDM3
initially: the freeze always happen.
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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 0245
IP: intel_ddi_post_disable+0x54/0x170 [i915]
PGD 0 P4D 0
Oops: [#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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