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[Christopher Barrington-Leigh <cpblpublic@xxxxxxxxx>]

I have upgraded to 16.04.  There are new problems with RAM/swap
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1585598) but
shutdown, which didn't work once in recent months on 15.10, works as it
should now under 16.04

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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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