Sandy Patterson, please address all of the following:

1. Is this something that started to happen after an update? If so,
which and when precisely?

2. In order to allow additional upstream mainline kernel developers to examine 
the issue, at your earliest convenience, could you please test the latest 
mainline kernel available from 
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ? Please keep in mind 
the following:
1) The one to test is at the very top line at the top of the page (not the 
daily folder).
2) The release names are irrelevant.
3) The folder time stamps aren't indicative of when the kernel actually was 
released upstream.
4) Install instructions are available at 
https://wiki.ubuntu.com/Kernel/MainlineBuilds .

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't 
boot into the OS) please make a comment in your report about this, and continue 
to test the next most recent kernel version until you can test to the issue. 
Once you've tested the mainline kernel, please comment on which kernel version 
specifically you tested. If this issue is not reproducible in the mainline 
kernel, please add the following tags by clicking on the yellow circle with a 
black pencil icon, next to the word Tags, located at the bottom of the report 
description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the issue is reproducible with the mainline kernel, please add the following 
tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of
kernel-bug-exists-upstream.

Also, you don't need to apport-collect further unless specifically
requested to do so.

It is most helpful that after testing of the latest mainline kernel is
complete, you mark this report Status Confirmed.

Lastly, to keep this issue relevant to upstream, please continue to test
the latest mainline kernel as it becomes available.

Thank you for your help.

** Tags added: bios-outdated-1.2.7

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => 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"
  --- 
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  apatterson   1965 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=7b947b8e-de50-4ab6-b7f3-254a5dea924a
  InstallationDate: Installed on 2018-04-28 (9 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: Dell Inc. Inspiron 7559
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic 
root=UUID=77f1cfec-1fe4-4201-9a91-9f00a5d7782b ro quiet splash 
"acpi_osi=!Windows 2015"
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  Tags:  bionic wayland-session
  Uname: Linux 4.15.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/26/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.2.5
  dmi.board.name: 0H0CC0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.2.5:bd09/26/2017:svnDellInc.:pnInspiron7559:pvr1.2.5:rvnDellInc.:rn0H0CC0:rvrA00:cvnDellInc.:ct10:cvrNotSpecified:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 7559
  dmi.product.version: 1.2.5
  dmi.sys.vendor: Dell Inc.

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