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[Christopher Barrington-Leigh <cpblpublic@xxxxxxxxx>]

Update: I take that back, or its reverted: the machine will NOT shut
down and, in fact worse than before, after the upgrade there seems to be
no way to see the terminal output during shutdown.  Pressing ESC during
shutdown now gives a blank screen rather than showing what is going
wrong.

The machine just keeps showing moving coloured dots on its shutdown
screen forever, until I force a power down by holding the power button.

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https://bugs.launchpad.net/bugs/1573597

Title:
  Problems with shut down and boot (Lenovo T450s)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My Lenovo T450s under Ubuntu 15.10 does not poweroff normally.
  Instead, it hangs on "Reached target shutdown".  (See image)
  Along the way, I believe there is briefly a full page of "drm:gen8_irq_handler [i915] *ERROR* The master control interrupt lied (SDE)!" messages.

  If I leave it there for a long time (> 10 minutes?) it does/may
  actually turn off without me forcing it off, but this makes no
  difference to the subsequent behaviour.  Moreover, if I press Ctrl-
  Alt-Del fast, many times, I get the "Rebooting immediately" message,
  but it doesn't.

  When I try to boot, I experience the following. It requires at least
  two reboots to be able to log in:

  On the first boot, the Grub page is skipped, and it hangs on the Ubuntu logo with moving dots.
  Eventually, I reboot it. 
  The second time (this is all reproducible), it boots but very slowly. It stalls at "britty.service" and eventually gives me a message
  about dev-disk-by , where it waits for 90 seconds before booting.

  After that, things proceed to a normal login screen. Behaviour after that is sometimes normal.
  This is a 1 month-old  computer.

  Chris

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  cpbl       3380 F.... pulseaudio
   /dev/snd/controlC0:  cpbl       3380 F.... pulseaudio
   /dev/snd/controlC1:  cpbl       3380 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Apr 22 08:42:59 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=e5d0a2bb-27cf-494a-849c-1985d165fbd7
  InstallationDate: Installed on 2016-02-12 (69 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: LENOVO 20BXCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic.efi.signed root=UUID=ea2fb511-8d62-4b96-bdaa-4b3f7bf79cc6 ro noprompt quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET54WW (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET54WW(1.19):bd11/06/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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