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 1768139 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 -- 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/1768139 Title: Kernel crash when booting laptop with hdmi monitor connected Status in linux package in Ubuntu: Incomplete Bug description: When I boot a Dell Inspiron 7559 with an external monitor connected to the hdmi port I get a crash on bootup. I can see the following stack trace in journalctl: syslog contains: kernel: Missing switch case (6) in intel_prepare_dp_ddi_buffers Description: Ubuntu 18.04 LTS Release: 18.04 linux-image-4.15.0-20-generic: Installed: 4.15.0-20.21 Candidate: 4.15.0-20.21 Version table: *** 4.15.0-20.21 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status Linux exposure 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux 3) What you expected to happen I expected the laptop to boot to the login screen. 4) What happened instead I see a blank screen after grub and have to hard power off the laptop. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-20-generic 4.15.0-20.21 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Mon Apr 30 17:22:20 2018 InstallationDate: Installed on 2018-04-28 (2 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) This is a fresh install. I have modified grub defaults to include "acpi_osi=!Windows 2015" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1768139/+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