I'd like to perform a bisect to identify the commit that introduced this
regression.  Can you test the following kernels and see which ones
exhibit the bug:

4.4.19: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.19/
4.4.20: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.20/
4.4.21: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.21

You don't have to test all of them, just up until the first one shows
the bug.

Also, does this issue only happen with the -42 kernel?  Do you know if
it happens with the -39 kernel?  Do you know the last kernel version
that did not have the bug?

Thanks in advance!

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: linux (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Tags added: kernel-key

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  Ubuntu doesn't boot anymore {REGRESSION}

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  After I upgraded to latest kernel, Ubuntu does not boot without messing with 
grub (I had to delete quiet splash options). 
  Before upgrade it was OK.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-42-generic 4.4.0-42.62
  ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
  Uname: Linux 4.4.0-42-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  tomas      2090 F.... pulseaudio
   /dev/snd/controlC1:  tomas      2090 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Oct 14 11:32:56 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=2ff267c2-ec30-4f81-975c-46640f436942
  InstallationDate: Installed on 2016-09-13 (30 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  MachineType: LENOVO 10104
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-42-generic 
root=UUID=fd50bb86-da1a-45bb-957b-ea19b330d7ff ro rootflags=subvol=@ 
   linux-restricted-modules-4.4.0-42-generic N/A
   linux-backports-modules-4.4.0-42-generic  N/A
   linux-firmware                            1.157.3
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/21/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: ELKT31AUS
  dmi.board.name: MAHOBAY
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003 STD
  dmi.chassis.type: 13
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.product.name: 10104
  dmi.product.version: Lenovo C440
  dmi.sys.vendor: LENOVO

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