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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813796/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
